Where the
world gathers for metal finishing
Q&As since 1989


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Danger of eating rust?

Current question and answers:

Q. I pulled out a pie dish I use infrequently and saw that there appeared to be some minor rust spots on it. I washed it with a scour pad and dish soap without results so I decided to give C-L-R a try. This was a mistake and I appear to have stripped the shiny finish off the dish. I've tried googling to see if this would affect the safety of the dish but haven't found any results. I don't expect to be able to restore it because the CLR that has stripped the metal itself. Thoughts?

Vanessa Peter
- Toronto Ontario
December 27, 2020

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Hi Ted,
You're absolutely right. I tried the magnet trick and indeed, it is magnetic. We're not talking aluminum anymore.

Vanessa Peter [returning]
- Toronto, Ontario
December 31, 2020

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⇩ Closely related postings, oldest first ⇩

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Q. Dear Sir/Madam,

We use Stainless Steel Flatware (Spoon, Forks and Knives) for eating while at home. I have been under the impression that by using SS flatware in Dishwasher the former shall be prone to rust. However I have been using the dishwasher since long to clean my flatware. of late I have noticed that many of my spoon forks and knives have rusted. I have confirmed and they are certainly rusted. not have found the pattern we use, we are reluctant to replace these flatware unless we find new flatware with the same pattern. hence my family members and I have been using this flatware for eating. the rust has appeared in places of the flatware which is directly in contact with the food we eat. this has raised fears in my mind that I might be poisoning myself when eating from such rusted flatware.

I would like to be informed whether eating out of such rusted flatware might poison me or lead to any health hazard. if it is so I shall refrain from using such flatware as I would not like to put a few lives at risk. this in mind I have contacted you with the confidence that you shall be of valuable help in this regard. looking forward to your prompt response.

thanking you

With best regards

JIMMY

JACOB JIMMY
- MUMBAI, MAHARASHTRA, INDIA
2003

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Q. Dear Ted,

We would like to thank you for the information provided by you. As mentioned in my previous mail, I have noticed and verified that the same flatware we use is rusted. However we at our family are still using the flatware. I would be obliged to you if you could provide with information, as to whether eating from such rusted flatware is potentially dangerous and hazards to health. If so please let me know in detail because right now I am under constant fear and apprehension that I might be slow poisoning me as well as my family. Also would like you to mention the journal quotes regarding health hazard caused by the same enabling me to study in detail. Looking forward to your prompt response. Thanking you

With best regards,

JACOB JIMMY
- MUMBAI, MAHARASHTRA, INDIA
2003

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Dear Jimmy,

I just opened a can of food for my daughter with a screwdriver (because our can opener just broke). After I got it open, I noticed a small rust stain on the tip. I made my daughter something else to eat. Then I ate the can of food so it wouldn't go to waste. At this point I thought that it was pretty stupid of me to eat something that I thought might be hazardous to begin with, so I went online to find out if it is indeed hazardous (tetanus was my concern). I've had absolutely no luck finding out anything substantial.

I was searching for about 30 minutes when I came across your correspondence here. I can't believe that some from the "The home page of the finishing industry" told you to "look it up". Like there would be any other way to reach something as obscure as "The home page of the finishing industry" if you weren't actively trying to "look it up".

I want you to know that I can't believe the response you received. I hope that all of your experiences with Americans aren't like this was. I am NO expert in my field (educational multimedia production), but I help anyone who asks to the best of my ability.

Just one question: If you were worried, why continue to use the flatware until you found a concrete answer?

Ed P [last name deleted for privacy by Editor]
multimedia production - Eugene, Oregon, United States
2003

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Q. We have been boiling water in an enameled cast iron kettle. I just discovered that the bottom surface on the inside of the kettle has rusted. I have been suffering with a sudden onset of asthma. I am 52 and have never been asthmatic. Could there be a correlation between the rust contaminated tea water and asthma attacks?

Francesca Weiss
kindergarten teacher - New York, New York
2006

I think the original question was a good one and deserved a sincere response. A simple "I don't know" would of sufficed. As opposed to a snide, "you'll live" response. I'm sure the gentleman utilized this site for info and if you just said, "I don't know", he would have moved on to do other research.

Sharon N [last name deleted for privacy by Editor]
- Coon Rapids, Minnesota
2006

After cleaning my bar-b-q grill and seeing the racks that have sat out in the humid weather here under the cover of the bar-b-q all year I realized that rust must indeed be ingested by many, and in large quantities that we cannot see. As we do brush the crusties off the grill, inevitably we expose more rust. It is especially noticeable when a buttered bun comes off with lines. Well, we are not dead, however the toxicity will never be known unless we conducted an experiment. As many of us smoke or drink coffee, the taste buds have a tinny flavor most of the time, and metals would be hard to detect. If it interferes with your digestion, then be on the look out for the source of your unfriendly meal, avoiding the same in the future.

Lillian Joubert
- Port Alberni, BC, Canada
2007

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I just noticed while looking at the bottom of my Betty Crocker kettle that the element has rusted in many places and that there was a lot of rust residue at the bottom of the kettle. Like others in the column, this rust have been ingested with my coffee, did worry me. I have sent an email to General Mills about this subject and I am waiting for a response. Will keep you updated.

Renee from Montreal

Renee Houde
- Montreal, Quebec, Canada
2007

I obviously wasn't the 1st person to wonder if rust ingestion would harm me. I'm sure I won't be the last. I am not a person paranoid that toxins are chasing after me nor would I like Ted to waste his life freeing the world of their socially induced thinking and paranoia. I just simply stumbled across this site like many others before me in search for the answer as to whether my recent ill feeling was related to discovering that the opened and refrigerated can of fruit I just ate out of two days ago had some rust around the inside of the can. I had not noticed it at 1st and wasn't really concerned after I had already eaten and did notice it. When you start feeling bad sometimes in your mind you do start to wonder if you may have eaten anything or done anything to contribute to the problem. That's only natural.

I was a bit amused, concerned, and surprised to see the slight conflict going back and forth about the initial question of the rusted eating utensils. I completely understand the reason for the request of the medical information concerning the issue, although it may not have been necessary. I think that all that was really wanted or needed was a explanation of why rust was or wasn't something to worry about ingesting. Kristan seemed to give a short, simple, and reasonable explanation for why it is probably not something to worry about. Ted's initial response was not as direct as what you expect or are used to getting from a medical informer. I believe he meant well and tried to answer the question in a way as to say "ease your mind about it", and we probably should. This did not include a direct yes or no or even any explanations as to why he thought what he stated were his thoughts. Many people respect doctor's in their professions but are still aware that their thoughts and feelings are still human and subject to error. General explanation clarifies these thoughts for the person seeking information. He may have not understood the reason for further questioning but the answer would leave most feeling like they were not informed much more than if they had picked up the phone and just asked their neighbor what they thought about it. Providing research on the answer may be worth more than the answer so I can understand not wanting to go that route but when people spend a lot of time looking up information to finally get to this site it would not seem like too much to ask just to get a small explanation.

Whether it was meant or not the tone of Ted's last few responses to this issue seemed more annoyed, defensive and condescending rather than reassuring, informative and confirming. This is my 1st time on this site. I don't know how this normally works but I hope to see less conflict surrounding future responses if I choose use this site in the future.

Sha Hunter
- Atlanta, Georgia
2007

My son is renting a home built in the 1980's and it has the original dishwasher. The racks are so rusty that the rack posts are falling off in the wash cycle. I have been looking for documentation to back him up in requesting a new dishwasher and have not found anything. Does anyone know the hazards of washing dishes in this type of environment?

PJ Coulter
hobbyist - Sacramento, California
2007

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I would estimate that the dosage of metal is small if you can't taste it or get sick within twenty minutes of eating and entering your bloodstream. The bigger, and probably obvious issues are if the flatware can be cleaned well enough, and what kind of metal are you eating. Plain old iron is abundant in nature, and I would think is only absorbed by your body at a modest rate. Now they have discovered aluminum in Alzheimer's patients, but I would suspect the control patients as well. There are even publicly funded messages in the media now about not breathing flatulence. I don't recommend it either.

I'm guessing that you already made the decision not to use the flatware anymore, and you mainly wanted the proper reasoning behind it. My advice is to stop using them until replated by an expert, and then use them with pride.

G Hamm
- Chicago, Illinois
2007

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2007

I, too, stumbled upon this website looking for answers to the question about ingesting rust. Inspired to continue searching, I stumbled upon the following website:

http://www.realsimple.com/realsimple/content/meal/0,21770,1619581,00.html

What I thought particularly useful was the fact that they cited an apparent expert. Here's probably the most useful quote from that site:

"If you accidentally cook on a rusty surface, the food may acquire a metallic taste, but it won't warrant a trip to the ER, says Elena Juris of the American Association of Poison Control Centers."

Tom P.
- Fullerton, California

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S       I    T D    E E    F B    L A    O R    N

Call it O.C.D., but Teflon or any surface I cook on must be an impartial element giving off nothing into the food. A look at the chemical reaction has the answer. Chris Kydd - Encinitas, California March 5, 2008 May 2, 2008 Hi, Chris. I certainly have no issue with people who wish to not use Teflon cookware. But out of curiosity I do ask what you consider to be a safe material to use. Regards, Ted Mooney, P.E. Striving to live Aloha finishing.com - Pine Beach, New Jersey

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S              I     C    K D    O    E E    P    T B    P    T A    E    L R    R    E

Stumbled onto your site because I was curious about the possible effects of my old Revere Ware tea kettle that was producing green water from the oxidized copper bottom that had apparently penetrated all the way through to the surface that touches the water. Needless to say, I threw out the old kettle and went to Costco and bought a new one. It was my impression that Revere Ware was lifetime cookware, but that's apparently false where the kettle's concerned. Tea drinkers beware. Cherie Swanlund - Fallbrook, California July 3, 2008 Hi, Cherie. Copper pots are a bit different than stainless steel flatware, and not considered a food-safe surface. Your tea kettle and similar cookware probably originally had a tin plating on it. Restoring the tin is an "old world" trade for a very long time. You might find letters 25553 and 29192 interesting. Good luck with the replacement! Regards, Ted Mooney, P.E. Striving to live Aloha finishing.com - Pine Beach, New Jersey

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Perhaps the concern here is not so much over cause and effect (i.e.. does rust harm me) but rather the broader issue of correlation (i.e.. whether or not rust harms, is rust usually found with something that IS harmful, and therefore is rust a good sign that here is something bad and I shouldn't use the utensil).

Eg. a I step on a rusty nail or knife - isn't this the usual reason why tetanus shots are encouraged? It's not the rust, it's the fact that it has been there so long it has rusted, therefore it has been there long enough to pick up harmful organisms that might hurt me. Similarly, a rusty BBQ might imply an old BBQ, hence lots of cancer-causing leftover stuff not properly cleaned off over the years, hence making an otherwise less dangerous pit more dangerous to human health.

Paul Ng
- Johor Bahru, Johor, Malaysia
August 16, 2008

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September 7, 2008

I came across this discussion in the course of seeking information to either support or refute my wife's contention that rust (in fact, ANY ferrous iron other than stainless steel) cookware causes cancer. We recently married late in life, and her carbon steel phobia has led to the disuse of an authentic Chinese wok; a set of very high quality carbon steel Sabatier kitchen knives; and all of my mother's, aunt's and grandmother's cast iron cookware. Nothing but "stainless" (which we all know isn't REALLY stainless) steel for my better half.

My search for any shred of information even remotely suggesting a link between rust on cookware and cancer (or any other medical condition known to modern science) has proven absolutely fruitless. My own solution is to humour the wife and use the el cheapo "stainless" knives when she's around, but when she is traveling and I am cooking only for myself -- out come the Sabatiers and the cast iron pots and pans.

In short, my most diligent searching has disclosed nothing that even suggests eating of slightly rusty carbon steel utensils has any deleterious health implications.

Harwood Loomis
- New Haven, Connecticut

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November 11, 2008 Hi Ted, Just want you to know that I appreciate your response to rusted cook ware. Jimmy from India, My counterpart by the way got the answer he was looking for and if he wasn't satisfied has to look further or elsewhere. I too stumbled on this site looking for answers to using a iron skillet - which was bought recently by my wife. it has a rusted surface when washed and kept away and I was concerned about using it. I do not yet know whether I should continue to use it but from the responses I have received it is not harmful - as my wife suggested. So thanks any way for shedding some light on the subject. Have a great week and thanks for your effort in answering the question to the best of your ability and knowledge. regards, Adrian Lobo - Dubai UAE November 2008 Thank you, Adrian. For a skillet, you can nearly completely prevent rusting by keeping it well seasoned with cooking fat or oil. letter 4988 offers several people's suggestions for the best way to season cast iron skillets. Good luck. Regards, Ted Mooney, P.E. Striving to live Aloha finishing.com - Pine Beach, New Jersey

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Thanks to all for the comments, suggestions, etc.

We use cast iron skillets all the time, and one was really rusty when we got it. I don't worry about using it at all now.

We recently acquired a Hobart 1/2 HP meat Grinder that is really, really old. When my husband found it, it was very rusty. We have soaked it in vinegar [in bulk on eBay or Amazon] and used 00 steel wool [on eBay or Amazon] and now some sanding. It is cleaning up quite nicely.

I guess the main question is, would you be afraid to use the meat grinder?

Thanks for your continued support of this subject.

Laura Davis
- Hawley, Texas
November 28, 2008

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