What Causes Blue Toning On Coins - Coin Community Forum

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Author	Replies: 10 / Views: 847
Coinseller88 Valued Member United States 96 Posts	Posted 09/16/2023 8:01 pm * Edited by Staff to crop and/or rotate images. Please crop and correctly orient images before uploading. * Report this Post to the Staff

Coinfrog Bedrock of the Community United States 94367 Posts	Posted 09/16/2023 8:07 pm There is no simple answer to this. Copper can take on almost any color of the rainbow in different environmental conditions. Report this Post to the Staff
Spence Moderator United States 34396 Posts	Posted 09/16/2023 8:14 pm That is a good question. According to the interwebs, it looks like a mixture of equal parts vinegar and salt will do this, but I imagine the are a bazillion other ways too. "If you climb a good tree, you get a push." -----Ghanaian proverb "The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz Report this Post to the Staff
Coinseller88 Valued Member United States 96 Posts	Posted 09/16/2023 8:20 pm So there's no way it came from the mint this way Report this Post to the Staff
ijn1944 Bedrock of the Community United States 19119 Posts	Posted 09/16/2023 8:47 pm Environmental toning, yes--exposure over time. The coin didn't leave the striking chamber with that coloration/tint. Report this Post to the Staff
Coinfrog Bedrock of the Community United States 94367 Posts	Posted 09/16/2023 8:57 pm Definitely did not come from the mint looking this way. Report this Post to the Staff
Dearborn Moderator United States 94812 Posts	Posted 09/16/2023 10:14 pm When it came out of the mint, it would have been bright and shiny, afterwards, the copper will take on many different colors or tones due to the environment it was in. Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Edited by Dearborn 09/17/2023 09:26 am Report this Post to the Staff
Errers and Varietys Bedrock of the Community United States 73717 Posts	Posted 09/16/2023 11:42 pm Environmental factors will depend on how it tones. Errers and Varietys. Report this Post to the Staff
John1 Moderator United States 56855 Posts	Posted 09/17/2023 09:21 am Improper cleaning, IMHO. John1 Report this Post to the Staff
I6609 Pillar of the Community United States 1228 Posts	Posted 09/17/2023 10:14 am One thing that I have noticed is after giving a copper coin an acetone bath I will sometimes see those bluish colors you are seeing I'm not saying that is how your coin got the color it has but an observation on my copper wheat cents Report this Post to the Staff
Yokozuna Pillar of the Community United States 4618 Posts	Posted 09/17/2023 10:51 am Any number of factors could have effected the toning, but it may have made a trip through the wash in a someone's pocket. I've read that laundry detergent can cause copper to tone in some light pastel shades. ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!! Report this Post to the Staff
	Replies: 10 / Views: 847

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