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topic 18650

Blackening tin


A discussion started in 2002 but continuing through 2020

2002

Q. I have some galvanized tin sheets that I want to blacken. Want kind of chemical will work for that application and where would I get it.

Thanks,

Mike Evans
- Denver, Colorado


2002

? Hi, Mike. I strongly doubt that you mean actual tin metal, i.e., the chemical element "tin". You probably are using "tin" as slang for steel sheet metal?

The reason it matters is that the element tin reacts very differently to chemicals than the element zinc -- so it is important to know whether this metal is tinplate (tin coated) or galvanized sheet metal (zinc coated). Can you confirm?

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


affil. link
Black Patina for Zinc

2003

Q. Ok, I think you are right. It is galvanized steel. How can I blacken it? If you know, please.

Thanks,

Mike Evans [returning]
- Denver, Colorado


A. Hi again, Mike. There is a black patina made for zinc (probably most often used by stained glass crafters). I haven't used it, but my best guess is it should work on galvanized steel sheet metal. Good luck.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


Black for tin

2003

A. Black for tin (maybe for tin plate too):

Black for tin II:

Goran Budija
- Zagreb,Croatia



Blackening steel already in place

affil. link
Birchwood-Casey Gun Bluing

2005

WHAT CHEMICAL CAN I USE TO BLACKEN STEEL? IT IS STRUCTURAL AND ALREADY IN PLACE.
SEAN

SEAN LOCKYER
- PALM SPRINGS, California


2005

A. If all else fails, there's always black paint, Sean :-)

Most good black coatings, like black zinc plating, black nickel plating, and black chrome plating will prove impractical for work that is already in place. You could apply a cold black oxide (gun bluing), but this requires that the steel be very very clean, and it offers no corrosion resistance--you would have to keep the steel oiled, which is probably impractical.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha



2005

! I found out accidentally that galvanized steel can be rusted by using muriatic acid, I was cleaning my pool filter in my galvanized tub. Afterwards the tub started rusting over the next few weeks.

Tammy Rasmussen
- Lakeland, Florida


April 2010

thumbs up sign Yes, Tammy, muriatic acid dissolves the zinc coating almost instantly, leaving you with bare, rusted steel

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha



Blackening pewter

April 26, 2010

Q. Hi how do I blacken lead free pewter? Thanks for your help!

Charisse Papworth
spin caster - Mapua, Nelson, New Zealand


April 27, 2010

A. Hi, Charisse. Lead-free pewter is basically tin -- usually 90 to 98 percent tin. As such, Goran Budija's suggestions are probably the answer. Good luck.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha



Oxidizing or discoloring tin fishing sinkers

February 22, 2019

Q. Hi,
I am looking for a low cost DIY method to oxidize or otherwise discolor bare tin fishing sinkers to a flat finish or dark color or both without painting.

Tips or methods for the layperson appreciated.

Thanks.

Steve Ronald
fisherman - Santa Rosa, California USA


affil. link
Black Patina for Pewter

A. Hi Steve. I suspect, but don't know for sure, that commercial patinating solutions for pewter will darken tin. Let us know whether it works.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Aloha -- an idea worth spreading



December 19, 2019

Your Q, A, or Comment: Can I use Patina Cupric Sulfate Solution (normally used on Zinc, I believe) to darken/patina a paint can? Is there another solution I should use to get tin black (does not need to be a consistent solid color)? Looking to make candles from pint paint cans, so will need to withstand heat.

Garet Frost
Marketing and Advertising - Wichita, Kansas, USA


January 2020

A. Hi Garet. Most paint cans are made of tin plated steel, not zinc plated steel, so chemistry designed to darken tin will probably be more satisfactory. Copper sulfate will have some effect, but proprietary products which also include selenious acid will probably work better.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Aloha -- an idea worth spreading



Blackening process for Persian tray?

December 22, 2019

Q. Does anyone know what the blackening substance is used on middle eastern (Persian) trays. I need to add some darkening to a large decorative tray where part of the blackening was rubbed off.

Marty Wiskoff
- Monterey, California USA


January 2020

affil. link
Rockler
rocklerBrassDarkening
Brass Darkening Solution

A. Hi Marty. Google links are telling me that the most common Persian tray material is glass, but I suspect that the tin-plated tray that you are inquiring about is made of brass. There are blackening treatments for tin/pewter (and different blackening treatments for brass if that's what you actually have).

Can you tell us what you know about the tray, and send a photo of it to mooney@finishing.com please? Where the black has worn off is it silver colored or gold colored or copper colored? Many/most patinas and blackening solutions are not like paint that you apply on top of a surface, but involve a chemical reaction between the blackening solution and the particular metal of the surface. It's easier to predict what will work if you know what metal the tray or the surface of the tray is.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Aloha -- an idea worth spreading

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