Close! It's not plastic or epoxy, it's a chemical corrosion inhibitor. The copper is not "1 molecule thick", the corrosion inhibitor is.
One of the keys is the corrosion inhibitor the mint started using. Also, the planchet manufacturing process, minting process and metal purities...
Don't discount yourself, you've made some excellent posts! :D
Without knowing (and sometimes knowing) the nature of the residue problem - distilled water is always the best starting place. It's cheap, much...
Did you use water before jumping directly to acetone? Water should ALWAYS be the first solvent in any conservation project.
To be safe, test any plastic you plan on coming into contact with the acetone before using! Acetone is good at eating most plastics.
How are you sealing that baking pan? It will have to have a tight fitting lid or all your acetone will evaporate.
Very nice silver color! I have one similar to yours: [ATTACH] [ATTACH] [ATTACH] [ATTACH]
If you love your planet, DO NOT discard solvents down the drain. They should NEVER be allowed to enter the water system. The best way to dispose...
An SDS (MSDS's are dead since HazCom 2012 came into affect) is NOT a reliable source for composition information since only hazardous components...
Incorrect, methanol is more "non-polar" than acetone. This can clearly be expressed by looking at die pole moments for each: acetone = 2.91D...
$700 FREE SHIPPING REDUCED $680 FREE SHIPPING! Any marks you see are on the holder - the coin is almost flawless. [ATTACH] [ATTACH] [ATTACH]
http://www.lincolncentforum.com/forum/showthread.php?24220-The-First-Steps-to-Proper-Coin-Conservation
Nice looking VDB! No problem at 64BN, a shot at 65BN if the luster is strong.
I agree with Ides. Problems are usually due to impurities in the gold. Especially with ancients and the crude refining methods back then. Think...
Wow....refreshing to see great pictures like those on ebay.
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[ATTACH] [ATTACH] [ATTACH] [ATTACH] The 1910P is an underappreciated year!
I have a very nice added MM fake: [ATTACH] [ATTACH] [ATTACH] [ATTACH]
Drier coin, PMD.
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