According to the PCGS website: Last I saw, it was only using FTIR Attenuated Total Reflectance. A technique that is not very sensitive at all....
DDD, very common to the issue.[ATTACH] [ATTACH]
http://www.lincolncentforum.com/forum/showthread.php?24220-The-First-Steps-to-Proper-Coin-Conservation
Unless this was merely an experiment, it was a waste of time. Just not worth the time and money. Mint state 43P's are very inexpensive. It's...
[ATTACH] [ATTACH]
Like I said, I've never had good luck with clads. Most of them are cheap enough that it's not worth the trouble. I gave away a bunch of them to...
No idea except for the cent. This is caused by improper storage. I've seen a ton of sets ruined like this. I've only had good success with cents....
The corrosion is very thick and heavy. Any conservation effort will result in a cleaned medal IMO. The metal under the corrosion will be a...
I work in the metalworking fluid industry (20 years now) as Senior Analytical Chemist. I work with the same suppliers the Mint does. While I...
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...
Separate names with a comma.
