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Preparing sea shells for crafts or display

Q. Hi. I've been collecting mother of pearl buttons now for about four years. I do not keep them in air-tight plastic containers, as buttons need to breathe. So far, I've kept them in old tins that I have. About six months ago, while admiring my mop buttons, I noticed a build-up of white cement-like substance spreading across a few of my smaller ones.
Upon further inspection, I found it is corrosion spreading across my mop buttons and in fact infecting any buttons around it as well. Now, I do not understand why or how a shell from the water can be corroded at all. It seems strange to me. I've gone into button forums and searched and then researched and can find no real information. When people in these forums talk about their buttons being corroded, they are only ever speaking of metal buttons. I've found no other articles or forums where they are talking about mother of pearl getting corroded. My question is, How can I stop this corrosion from spreading and ruining my buttons and can I fix the infected ones and how? I guess it would be helpful to know why this happens as well. Thank you

andria wessner
button collector - pine grove pennsylvania
February 8, 2023

A. Well you are keeping them in old tins; the metal is seeping into them. I always keep mine in plastic or glass... mostly glass as they are polished like starfish and sand dollars, etc.

Try gently wiping them with mineral oil [this product on eBay or Amazon affil links] it should do the trick. For bigger shells you can do 1 part muriatic acid [this product on eBay or Amazon affil links] to 3 parts water in a plastic bucket then have water with baking soda [in bulk on eBay or Amazon affil links] in 2 other buckets as that neutralizes the acid; also never pour the water into the acid. Put water first then add the acid.

Wear long rubber gloves [this product on eBay or Amazon affil links] , use eye protection [this product on eBay or Amazon affil links] , and wear old clothes. After dipping the shells for 10 to 30 seconds instantly put into the baking soda water. The acid water mix removes any barnacles and brings out the real color of the seashell. After you have dipped them in the 2 buckets of baking soda and water, rinse with water then wipe gently with a paper towel and mineral oil. I don't know if you knew this or not. Also, if the mineral oil isn't enough to bring back your buttons try 2 parts peroxide [this product on eBay or Amazon affil links] and 1 part water -- you can leave them in there for up to an hour but I only do it for 15 to 20 minutes normally. Happy collecting and have a wonderful day.

Gina Petitpas
- Jacksonville
April 21, 2023

exotic seashells on eBay affil link

Q. Do you know anything to easily remove the brown "varnish" (periostracum) from shells like razor or varnish clams?

I've tried soaking in strong diluted bleach for weeks, boiling, oxyclean. The bleach caused tiny "bubbles" to form, but very little change in the ease of removal.

I am currently trying a solvent called ScraPerfect's Best Cleaner Ever [this product on eBay or Amazon affil links], and am hopeful, but not very confident it will work.


Amy Roszak
- Poulsbo, WA
March 6, 2024

⇩ Related postings, oldest first ⇩

Q. I've read comments about polishing/cleaning sea shells including "buffing" with a material from a lapidary supplier. I'm trying to clean numerous shells, many are fragile (mussels, moonshells, etc.) and I know they would not do well in a tumbler. Could you comment about how to use the "chemical" in a hands-on approach?

It appears that the surface of our shells is calcium, salt, etc. We can purchase commercial sea shells that are cleaned to the natural color, but we want to clean the ones we find.


Geri Sera
- Nanaimo, BC, Canada

A. Geri:

In addition to selling chemicals to the metals industry, I am a seashell collector. We collect and clean thousands of seashells.

It depends a lot on what you plan to do with the seashells and what you want them to look like. Normal shell cleaning consists of descaling with diluted bleach [adv: bleach/sodium hypochlorite in bulk on eBay or Amazon affil links] , followed by cleaning and then putting a light mineral oil [this product on eBay or Amazon affil links] or similar material on the surface to bring out the color. Other chemical cleaning is usually injurious to the surface.

lee kremer
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Lee Kremer
Stellar Solutions, Inc.
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McHenry, Illinois
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Q. I'm an art therapist, and didn't care much about sea shells till now. 4 months ago I started a treatment with a child of 10 years old, and the only way to start a dialogue with him was by sea shells. So I began to collect them, to read books about them - because this child asks many questions about them - and was fascinated with this new world. He himself started his own collection. Our question is: how come the shells that we buy are so bright and "clean"? is there any way we can do it in my clinic? I appreciate your reply, thanks.

Aliza Galkin
art therapist - Moshav Amikam, D. N. Menashe, Israel

A. The reason that the shell you buy are bright and shiny is probably because (depending on the species) it was collected live and still in good condition. After a shell has been on the beach for awhile it very quickly erodes and loses its luster. If the shell is shiny inside but not on the outside it could be coated with deposits that can be removed with bleach or similar material, then coated with a light mineral oil or baby oil to bring out the colors. It is often necessary to pick off thick deposits or remove them ultrasonically.

lee kremer
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Lee Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
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Q. I got an abalone shell from a sushi bar; how can I clean it before using it for jewelry?

David Reeves
Misawa Japan

Diamond drills for beach glass and sea shells

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Q. Well, I too have recently returned from the Bahamas and we found a conch shell while snorkeling. We have gotten the meat removed, while in Bahamas, and a local told me to soak it in water and bleach... most of the debris are gone but it now has a white film on it. What do I do next to finish cleaning it?

Brian Peterson
army - Fayetteville, North Carolina

Q. I have been trying to find out how to polish sea shells. I have read various sites where it is suggested that you use a tumbler. I did not want to invest that much money into the effort. I was told that once the shell was soaked in diluted bleach water, I could polish it with a rag and car compound, and then to seal it with clear fingernail polish. Has anyone used this technique and how has it worked?

Linda Riley
- Virginia Beach, Virginia

A. I've also been experimenting with sea shell cleaning. I discovered the film left on the shell from the bleach, so I soaked one type, an oyster shell, in vinegar [in bulk on eBay or Amazon affil links] for a short period and it turned out great!

Chris Feemster
- Port Orchard, Washington

"Smithsonian Handbook: Shells"
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Q. I have tried the mineral oil on my shells with good results initially but after the oil soaks in, the color turns back the way it was. Which is a whitish color. Is there something else I could use that would not soak in as much? Or do I need to soak longer in vinegar or bleach?

Criss Helms
- Capitola, California

exotic seashells on eBay affil link

Q. I have oyster shells that I would like to re-use in cooking: for various dishes served on the half shell, so I'm trying to get them as odor-free as possible. So far I've scrubbed them with salt and vinegar, boiled them, soaked them in vinegar water, scrubbed with baking soda [in bulk on eBay or Amazon affil links] . They still have an odor. If I bleach them, will they still be usable as food containers? Has anyone else done this?

Carolyn V Jones
- Baltimore, Maryland

Q. I am making crafts using shells. They have rust on them. Can you please tell me how to remove the rust and how to add luster to the shell?

Anit [last name deleted for privacy by Editor]
- Hamilton, Ontario, Canada

A. I collect fresh water muscles to use the shells in jewelry making and carving. I have a method of cleaning and polishing that works very well, but it is time consuming and a bit of a chore. And I have heard a method that I will explain and then hopefully try when I get the materials.

With the river or clam shells I clean then as well as I can with soap and water. Then I usually use a Dremel [this product on eBay or Amazon zaffil links] to cut them into the shape I want. After that I use 600 grit waterproof sandpaper to polish the outside and inside of the shell. I polish or sand them underwater and this works very good to bring out the shine. After they are smoothed by the sandpaper I take a Dremel buffing pad and some jewellers buffing compound [this product on eBay or Amazon affil links] (very little as it can stain the mother of pearl. And buff it to a very high gloss finish. This brings out more color than you would ever imagine there was in a simple river clam shell. But it does take a toll on your fingers.

Another method I've heard involves muriatic acid [this product on eBay or Amazon affil links] -- The kind of stuff you get to clean your cement floors prior to sealing them ... garages and stuff. You use rubber gloves [this product on eBay or Amazon affil links] and dip the shell in the acid. The acid quickly eats away anything on the surface of the shell. A few seconds for smaller shells would be more than enough. This is how they get abalone so shiny so it should work on other shells as well. Rinse thoroughly with tap water and rub thoroughly with a towel it should be nice and shiny ... however I have not tried this yet so do not do it if your shell is precious or a great find -- try it on broken not so perfect shells first (something you would not be disappointed to lose). I intend to try this the next time I get to the department store. Good luck if you beat me to it.

Michael D Stoner
- Sioux Falls, South Dakota

thumbs up sign I agree this is the best method! No bleach is necessary as it can take away color from the shell. It is more time consuming to do it this way but you are rewarded with true color and shine and that lasts!

Amy Townson
- Morehead city, nc
July 9, 2023

Q. I have collected several shells, from the Great Lakes. I wanted to try to make into jewelry, but don't think they can handle a tumbler. How do you polish them.

Kristi Loving
- Redford, Michigan

Q. While vacationing in St Lucia, we purchased a freshly caught conch from a beach vendor.
The meat had already been removed, and he descaled it for us, but it needs to be deodorized.
I have had it soaking in, first, clean water, and then switched over to baking soda in the water in an effort to rid it of the smell, but to no avail as yet.
Can anyone please recommend the best way to de-stink the shell?
If bleach is to be used, what is the best measurement to observe?

Thanks in advance!

Kim McMillan
- Burlington, Ontario, Canada
May 12, 2008

A. We have found from the locals here on the Island the best way to rid a shell of the smell is to place it by an ant hill and the ants will eat any remnants left in the shell. Our conch shells come back from the ant hills odor free and ready for the shelf.

Greg Snider
- Isla Mujeres, Mexico

Q. I have several sea oyster shells that I am wondering how to not only get the smell out of them, but, to also get the beautiful mother of pearl. I have soaked them in bleach water now twice, but, they still have the smell. How do I get the outside of the shell off without ruining the mother of pearl?

Kathy Sevilla
- Clinchco, Virginia
September 21, 2008

A. You must be very careful using muriatic acid to clean your shells, as it will dissolve them if left in it for very long.
You must dunk the shells in then take it out and rinse in clean water and do this until the desired affect is reached. Real thin shells will dissolve very quickly. Soaking in 50/50 bleach water for 24 hours will remove most stains and disinfect the shells, then rinse well in clear water, then use Lime-away and a scrub brush to finish cleaning. A very high polish can be achieved by using a fine grade of waterproof sandpaper and sanding under water.

Jim Halliwell
- Dome Valley, Arizona

A. Hi there, according to what I have read dilute ammonia [this product on eBay or Amazon affil links] is the way to go to clean shells especially to take the brown outside off pearl shells. I have just found a gorgeous woven island clutch bag decorated with a cleaned abalone. It is stunning.

Before you could go to the shop and buy ammonia, urine, animal or human, was the substance of choice.

This free substance was also incredibly useful in other processes such as dyeing. Dilute ammonia and certain types of lichen produce stunning dyes.

Frances Winters
- Sydney NSW Australia
March 9, 2010

A. I have made several pieces of art work with shells and the quickest, cheapest and successful I have been at making shells shiny is by using silicone spray [this product on eBay or Amazon affil links] which you can purchased at a hardware store for about $5 per can.

I hope this helps

Steven Newland
- New Zealand

Q. I have a giant Tridacna shell that needs some attention. I'm not concerned with the exterior, but would like to clean and polish the interior. It's too large to hold up to a buffing wheel. It has possibilities to be quite handsome if it were cleaned and polished. All I've ever done to it is wash with a dilute bleach/water solution, and a stiff brush. It looks clean, but is kind of dull.

Gary Miller
Hobbyist - Ilwaco, Washington, USA
March 17, 2013

A. Good day Gary.

I have no idea what a Tridacna sea shell looks like, I'm sure it must be impressive, because you see the beauty of it.
You might try a very fine pumice with water to remove any rough features, a good water rinse, and apply a clear lacquer or similar to give the porous surface a sleek finish, thereby giving it some measure of reflectivity.
I tried to preserve corals myself while snorkeling in the Caribbean, and after cleaning, drying (removing the live organism itself), these corals today are quite impressive.
Hope this helps.

Eric Bogner
- Toronto, Ontario, Canada

A. I'm going to guess that you want to polish the thing to a high shine. I'd suggest wet sanding with 500-800 grit and work down in grits to 1200-2000. Then use an automotive buffing wheel with a very fine polish (5 Micron alumina and diatomaceous earth would be my suggestion, mix in a 2:5 ratio with water).

Marc Banks
Blacksmith - Boone, North Carolina, USA

A. If you are looking to remove the crust that forms on Sea shells, use a wire brush attachment on a Dremel. Finish with a coat of mineral oil.

You should know I am not a professional but I bring home shells every year from Florida and this works well with conchs.

Rich Benson
- Richmond Hill, Georgia, USA
December 14, 2014

Q. Hello, I want to decalcify mussel shells to flatten them to make lamps. Does anyone know how to do this?

Kay Hampton
- Timmins, Ontario, Canada
April 26, 2015


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A. I found some conch shells on Anna Maria Island. They looked faded and had barnacles all over them. I simply picked the barnacles off with a fingernail wood stick. Then dip them in a solution 1 part muriatic acid to 4 parts water. Stir for about 5 seconds then immediately dip into cool water. Set them out to dry. After they dried I rubbed them with mineral oil and they looked beautiful!!! With my other shells I've found, for example scallop shells, I pick barnacles off, if any, and then I buff the surfaces with a fingernail buffer. After that, I polish them with a clear coat of fingernail polish and set to dry. Some shells I've found have needed some extra attention. Specifically ones with really rough edges or even slightly broken shells. To fix them I bought a Pedi-file ⇨
(as seen on TV). It's an electric nail file basically, but it works well for shaping and smoothing shells. After filing I always coat my shells with mineral oil, baby oil, or a clear coat of nail polish. Hope this helps!

Amanda Pacetti
- St. Augustine, Florida, USA


thumbs down signCame upon this site looking for a way to polish a shell I purchased from a black pearl dealer in Polynesia. I also snorkel & scuba dive as a hobby. I got some great ideas here but am appalled at some posts. One should not take living Coral or Conch's from the sea!! The oceans and their denizens are in great peril.
They do not need to be further damaged by unknowledgeable, periodic interlopers. Do not touch anything with bare hands either.
Thank you.

Kathy Rodgers
- Shawnee Mission, Kansas, USA

thumbs up sign  Hi Kathy. True enough! Thanks for the warning about touching things; mindlessness is an easily fixed fault.

There are well over twice as many people on the planet as when I was young, and even then a lot of resources were being exhausted without us being conscious of it. What was once thought to be just a drop of water in an endless sea is now recognized as a serious problem. With ever higher population and ever dwindling resources, the world might one day soon decide that snorkeling & scuba diving are and were harmful. If that happens, I hope that people regard it simply as an error rather than being "appalled" ... we should try to be gentle on each other as well as on the natural world :-)


pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey

exotic seashells on eBay affil link

A. I have collected many shells so I've been testing ways to bring back shine. I've found washing with bleach, peroxide, baking soda, whichever you find best to clean/deodorize shells. Some needed soaking 24 hours or longer. I've not ever had a smell problem. Unfortunately coming home with a hermit crab does happen. He will die fairly quickly without salt water. I soak them in bleachy water and have my husband pull the dead animal out or you can place shell in pot of water bring to boil and the tissue will boil out. Ants doing the job would work great if you don't mind waiting. After drying, rubbing with an oil is essential for colors to return and make it shine. I've used my face cleaning oil with coconut and Aragon oils as well as Palmers awesome! Usually 24-48 hours later I paint polyurethane on them. Not just to make them extra shining but tough. They don't feel so fragile and will last years.

Shannon Stinson
- Freeport, Florida USA
April 11, 2016


!! That thing that some of you are referring to as "meat", isn't just "meat"! It is a live animal body. It is so so so cruel to me when I think that we human beings are so selfish that would go intrude into these animals habitats by diving or snorkeling, collect those living animals, kill them and remove them from their shells and then polish them to decorate our house or sell them for sake of some money.

I understand that the live shells are not comparable to the dead ones in how nice they look, but same applies to humans as well!

Neeku Sh
- Dublin, Ireland

thumbs up signHi Neeku. It has always been a dog-eat-dog world, and I can't fault people who eat conch instead of chicken, or beef instead of pork, if they believe that animal protein is necessary for their own and their children's survival.The same with aborigines who used conch shells as horns for vital communications, religious symbols, or garment buttons. But cheers for vegetarians and vegans, kindness is king.

Times are always changing, and today many of us lead lives of such easy leisure and freedom-from-want that we question whether conch shells may be used as decoration -- we no longer think ivory should be :-)

Personally, I believe that deferring to the "feelings" of living things needs to be proportionate to their level of consciousness ... otherwise how can we justify killing a tick that is infecting our puppy, swatting biting flies that are driving a helpless horse mad, or protecting our children from malaria-carrying mosquitos?

Love of animals is a wonderful thing! But people are the most conscious form of life that we know of, and if we use love of the lower animals as a justification for misanthropy we've got life backwards :-)


pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey

Q. Have read with interest how to clean up shells. Am hoping that the conch dweller "meat" was actually eaten and not discarded, as waste not want not, etc. Can anyone help with removing a horrid bright yellow stain from a large vintage mother of pearl bead ? It's from about the 1930's and is lovely apart from this awful stain that looks like dye. The nacre is a beautiful creamy natural colour and I don't want to bleach the bead white. Any help greatly appreciated. Thanks, Jules

Jules Cooper
- London England UK
June 16, 2016


!! My schooling and love of my life has always been Marine Biology. I dove in most of the recognized sites worldwide and many many more of the unknown sites.

Cleaning a shelled invertebrate [salt water] that has recently been fished for food is easily done with 50/50 fresh water and bleach. It will take a couple days to get the smell out but be patient. Rushing it with muriatic acid is an incorrect path to take. Using a brush or pick after the shell has soaked is ok.
Personally, I don't condone the taking of live sea life unless used for food. Conch BTW is quite good. There are plenty of shells recently discarded by local fisherman providing an abundance of shells for the collector. The only concession you must make is dealing with the small hole at the crown of the Conch, where the animal was removed.

After at most one week, the smell should be gone. The ant solution was a new one to me but quite logical. Thanks for the info.

To polish the mother of pearl layer I use 2000-4000 grit wet sandpaper and bring up the shine gently. Again patience is the key. Any organic oil that you would use on your body will bring back the gloss. I would not seal this layer with any inorganic solution like poly or lacquer. Regular oil maintenance similar to furniture care is sufficient.

To finish the outer layer is another matter, a wheel with finishing compound is a good method. Soaking the outside with your chosen interior oil will help.

I think it generous of people to post their solutions; however, taking live coral from the ocean is something to be embarrassed about.

The whitening out of much of the world's reefs is a serious problem. A coral has a very narrow life support range in terms of temperature and salinity. Merely touching the exoskeleton (your collection) with a bare finger will kill the animal inside the skeleton. To give you a shot at developing an appreciation go on a midnight reef dive on a coral reef. When you see the abundance of fragile coral extended, waving in the ebb and flow and exposed, an impression should be made upon you. One that turns you into a protector instead of bone collector.

It's never too late to learn and pass it on. Good luck on your collecting and showcasing but please make as small of a footprint as possible when visiting the UW world.

John Pierson, Marine Biologist, PADI DCD retired
training - Henderson, Nevada

Dremel 422 Polishing Tip

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A. If I may, I would like to share what I have found by trial and error with polishing oyster shells.

Instead of jeweler's rouge, a plain toothpaste works quite well and doesn't stain the shell. I use a whitening formula toothpaste (not the gel kind) with the Dremel polishing tip #422 ⇨
and I have had excellent results, even without soaking in bleach or muriatic acid first. However, it does take quite a bit of polishing. It may speed up the process to use bleach or muriatic acid first, then the Dremel and toothpaste. I will let you know when I experiment :)

Charlyn Miles
- Maypearl, Texas, U.S.A.
November 26, 2017

Q. I have a big white turban shell I got from flea market and it's a beautiful silvery pearl sheen under the thick white stuff. How do I get that off?

Trina Seiber
- Healdsburg, California
May 20, 2018

A. Hi, Trina. Should work if you just put the whole shell into a bleach solution (mix it 50/50 with water). Do not get the bleach on your clothes, or even your hands.

lee kremer
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Lee Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
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Q. I purchased a carved conch shell in Pompeii, Italy. It was only after I unwrapped it that I smelled the horrible odor. If I put it in bleach will it harm the carving? What can I do to correct the smell problem? Thanks so much. Janie

Jane Cohen
- Atlanta, Georgia USA
June 26, 2018

Food-safe coating for sea shells?

Q. Hi: I was wondering if someone might be able to help me. I am interested in finding out if there is a product that I can use that is food safe and easy to apply to the inside of cleaned out and sanitized oyster shells. I want to use them for salt and pepper vessels for my daughter's wedding. I want the finish to be clear so that the beauty of the inside of the oyster shows through. Any help would be so much appreciated. Also, if you have the name of a source of where I could purchase the product that would also be so much appreciated, as well. Thanks.

nancy lou
- towson, maryland
October 1, 2018

A. Hi Nancy. Many clearcoats are food-safe, Protectaclear from Everbrite [a supporting advertiser] among them.


pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey

Q. Need some help, I have a sea shell neckless that my Grandfather brought back from Hawaii at the end of WWII. It needs to be preserved somehow, anyone familiar with such a project?

Allen W Baldwin
- Clever, Missouri usa
April 22, 2019

exotic seashells on eBay affil link

Q. Is there a way to cover the pin/needle holes on the shells. Water drips through them when it's filled.

chris nathan
- Washington dc
May 17, 2019

Q. So I've been collecting shells for sometime now and I've recently made my own polish using beeswax [this product on eBay or Amazon affil links] , however I'm wondering what I can possibly put into my mixture that will also take away the Calcium build up, I've used a hand moisturizer that once applied instantly takes away majority if not all calcium build up. Any suggestions?

Kaila Torres
- Honokaa Hawaii
February 5, 2020

Q. I collected a few shells from razor clams on the WA coast that were probably recently eaten by gulls. They have a natural "varnish" layer on the outside (like "varnish clams"). After a couple of days, a whole section just peeled off, leaving the hardened varnish layer on about half of it.


Any ideas how to remove this brown layer?

Amy Roszak
Crafter and inventor - Poulsbo, Washington
November 3, 2021

Q. Hi! I read through everything and didn't see much info about freshwater shells - except some brief info on river clams. Well, I live in Miami, and I'm trying to start a business where I repurpose shells, but freshwater instead of saltwater. (They are some species of Apple Snail)


The shells are ALWAYS empty, otherwise they go back into the water. Yes, snail shells are "ugly". But they are just a part of what I'm making. I need to make sure the shells won't smell (by the time I get them, all animal matter has been removed, and they usually don't smell anyways), are clean and shiny, and I don't want to use chemicals harmful to the environment. I've read about the use of muriatic acid, bleach, mineral oil, lacquer, etc. I've also read about different methods of buffing/polishing. My main question is, since the snail shells (I will also be using some freshwater mussel shells) are more delicate than, say, conch or clam shells, is there a different way to clean them? The snail shells especially are very thin compared to invertebrates found in salt water (some shells are quite large - about 5 inches across, but very thin) and can shatter very easily. Does anyone have any tips for these very thin, fine shells that won't harm the environment?

Rita Bentley
- Miami, Florida
January 19, 2022

Q. I found a whole clam shell while snorkeling. The boat captain recommended lacquering it to keep it together. Is that a good idea, and what type of lacquer?

K Jack
- Denver, Colorado
April 28, 2022

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