1914 D Barber Dime Verdigris problem.

If that is the case, you did not follow the proper procedure. i.e. the acetone used was contaminated. Clean acetone will leave no film and the coin should have been rinsed again in clean acetone.

 

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Picky-picky of course you are correct with medical grade chemicals but I use finger polish remover in the bathroom! Only kidding.

 

No.

 

Yes. See above about contamination.

I'll bet (from my experience) that most collectors, and many dealers use contaminated acetone and they couldn't spot haze on a coin if you stuck it up to their eye.

 

I'll pick up some acetone on my day off and do the acetone soak. I'll take some up dated photos of the coin and also a video. ( I've got a youtube channel for coins ( and other antiques too ). Some of you may have seen them.
I really appreciate all the help towards my coin. I'll do the 24 hour soak, quick rinse in acetone and distilled water and air dry. On a side note, I showed this coin to a dealer at a coin and jewelry shop up in Michigan and he offered to use a toothpick to try and get this spot off. I politely declined. He estimated the grade at ms 63 or 64. He did ask me if I was interested in selling it. I again politely declined, and instead picked up an MS 66 Iowa Commem from him. LOL His price on it was cheap IMO.

 

Ewwwwww...green milk?

 

BTW, "Medical Grade" might be really crappy, it just wouldn't kill you. Real pure chemicals come from chemical companies marked as "Reagent Grade" or some such. Look for 99.9% pure.

 

Since most of those "impurities" would be water (with some ethanol and isopropanol), more importantly it would have <0.001% evaporation residue.

 

Or ten parts-per-million.

 

And that did not even come from reagent grade acetone!

 

Then, may I ask, what did it come from?

 

320110 Sigma-Aldrich
Acetone
ACS reagent, ≥99.5%

Aldrich is one of the most respected vendors in chemistry.

 

That's what I think we use as we need to order it from Fisher.

 

Sorry, it was a reagent. Just that they hid the reagent and it was not 99.9% like you specified.

 

To be fair, though, glass is a lot harder than coins.

 

I will preface this with a question for the more knowledgeable: If a substance requiring MSDS is adulterated with water, could the MSDS still call that substance "100%" in concentration? Kleen-Strip's MSDS for acetone lists it as 100%.

Near as I can tell the only thing you will possibly find added to commercially-available acetone is denatonium benzoate, the bitterant added to make it unpalatable to animals. I suspect it's only added to acetone intended for the fingernail industry; those are the only acetone products I've ever seen the substance listed on as an ingredient.

I cannot understand why people insist on rinsing with water after acetone use.

 

Sorry, what is "Care"? Verdi-Care?

 

http://www.wizardcoinsupply.com/products/verdi-care.html
As made by Badthad!

 

Coin Care is sold by Betterbilt Chemicals. It removes contaminants from coins. I do know that "Care" is used at NCS. That's why I use it on a daily basis for conservation. These statements are 100% true.

Now comes conjecture: I believe "Care" may be similar to a chemical called "Blue Ribbon" which is no longer sold. This was an amazing product; copper collectors guard their remaining supply. I do not know when "BR" stopped being made. The chemists on the site probably know what's in it. It leaves an oily film on the coin, possibly as a protectant. So does Coin Care and VC.

I have purchased VerdiCard and have PM'ed its maker, and have used it. So far, I prefer Coin Care as it is faster, easier to use, and old habits die hard.
I have not given up on VC as it seems to do the same basic things. I'll let its maker tell us why Care is bad and VC is good.

I will say Care is dirt cheap! I can flood the coin's surface with it and even leave it on for hours but I do not soak coins I'm conserving. I get the job done.

 

Wizard Coin Supply sells this: Sorry, I was thinking Blue Ribbon and got this instead.