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 Replies: 28 / Views: 1,396 |
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Moderator
 United States
72105 Posts |
I bought the stuff, thinking to dip my 1970 4 dollar FAO coins from the Caribbean as they are a bit hazy ( milky on the fields, but the stuff is for copper, gold or silver - no mention of cupro-nickel. I have never used this stuff, so I'm asking for a bit of advice before using it. here is one of the coins:   |
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Bedrock of the Community
United States
17517 Posts |
Pick the lease valuable specimen and give it a try. No sense in any of us trying to make you feel numismatically inferior.
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Bedrock of the Community
United States
94367 Posts |
Or just take a cheap C/N coin and experiment. Often these solutions can be diluted as well.
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Bedrock of the Community
United States
18710 Posts |
Quote:
Or just take a cheap C/N coin and experiment. Excellent advice. Quote:
Often these solutions can be diluted as well. More excellent advice. I don't think E-Z-Est will do much for that hazing without adverse effects. Most likely it will strip the surface layers of the coin, leaving it flat and lifeless. But looking forward to your results (hopefully from a lesser coin) as I have quite a few coins that have similar hazing.
Inordinately fascinated by bits of metal with strange markings and figures
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Moderator
 United States
72105 Posts |
yep, time to experiment..
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Pillar of the Community
 United States
1809 Posts |
Does the container list the contents? Likely some acids are included.
I have a chemistry background, thus may be able to provide some insights.
I agree the advice you have been given so far is good.
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Bedrock of the Community
United States
18710 Posts |
The MSDS lists sulfuric acid: 1-5% and thiourea: 3-7%.
Inordinately fascinated by bits of metal with strange markings and figures
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Moderator
United States
164276 Posts |
I would not use it. But if you do, then dilute, dilute, dilute. The stuff is stronger than you think and a coin can go from conserved to wrecked in a nanosecond. Experiment on some pocket change first.
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Pillar of the Community
United States
1809 Posts |
Thiourea is typically used for cleaning silver, as it will quickly remove any oxide or sulfide toning that has happened.
This will definitely change the appearance of any silver coin it is used on, but will not harm gold.
The inclusion of sulfuric acid adds a whole 'nother level to the surface effect.
One needs to handle this substance carefully, as it will damage almost any metal (or skin) that it touches, even in dilute form.
It can leach copper from bi-metallic coins because nickel is more resistant to the acid. This can result in surface pitting with prolonged exposure.
It can also damage plumbing if washed down the drain.
Experiment at your own risk.
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Pillar of the Community
Canada
5184 Posts |
Do NOT use this stuff on CN proofs!!!
Removing light cloudiness from CN proofs
can be accomplished by using Sudsy
Ammonia. Swirl around in a glass dish , do not rub .
Wash with warm distilled water, air dry on paper
towel .
Also if you are skilled enough in PROPER use OF
MS70 that would work as well .
Edited by Pacificoin
12/19/2024 12:07 pm
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Moderator
United States
72105 Posts |
Thanks everyone for your well informed input and opinions.
MS70, huh? maybe I'll go that route or the Sudsy Ammonia first (so I'm guessing dish soap and ammonia?)
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Moderator
United States
164276 Posts |
Yes, soap and ammonia, but you can buy it pre-mixed. I would not make it yourself. I would hate to accidentally use a soap that had bleach in it.  |
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Bedrock of the Community
United States
18710 Posts |
Inordinately fascinated by bits of metal with strange markings and figures
Edited by Hondo Boguss
12/19/2024 12:43 pm
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Moderator
United States
33158 Posts |
An interesting experiment to be sure but as the beneficiary of inheriting many "improved" coins, I would just echo the sentiment to go slowly and with lower value stuff at first. Looking forward to before and after pictures!
"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
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Pillar of the Community
United States
2252 Posts |
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Looking forward to before and after pictures! 
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Pillar of the Community
United States
3144 Posts |
Quote:
PROPER use of MS70 that would work as well.
"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae
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Replies: 28 / Views: 1,396 |
Posted 12/19/2024 09:19 am
