I would get a vented one and only fill from a storage container ( brown glass or metal) just before you use it if you want one. In the lab, we...
The plastic tweezers in the url marked for chemical resistance are made of acetal or nylon, both of which has a hardness rating higher than bone....
No, it isn't a DD. There is some machine doubling ( on left side of numerals) and then either deteriorated die on the right side of the 3, or...
Nah, they have just heard on the bullion blogs and forums so long, that true PM 'stackers' keep saying they believe the USD is worthless, so they...
Young Numismatist
I wasn't arguing that. I was fairly sure at what point the 38.5 is determined as the nominal diameter as I can see where the collar would be a...
Is the diameter determined by the dies/collar? or by measurements taken by sample afterwards. I have always assumed the former, but don't know if...
And just to think what would all of this long time range have to say if the earth was just 15 minutes off its orbit, or the 150 ft asteroid was 15...
There is a physical property known as Specific heat or specific heat capacity. It is the amount of heat required to raise a mass ( usually 1 gram)...
Yes, and they have a majority zinc core and a 100% copper cladding . In a moist environment with high sulfur content air, Corrosion can occur in...
Corrosion. The pure copper layer on clad cents corrodes very very fast compared with the 95% alloy.
I would certainly use fingers rather than any type of tweezers. Arthritis problem would seem to be more difficult with maintaining steady pressure...
Did you weigh it before you started ?
The tolerance on those is +/- .097 grams. Although most weigh quite close to the specification of 26.73 grams, a range of 26.633 to 26.827 is...
What you suggest is technically possible, but if it was the case, this would be a well known variety as the working die's output would all have it...
Chris, although it wouldn't have much effect on slabbed coins, If the boxes were stored in a safe or enclosed protection, they might create a...
A broken mint mark punch would have produced raised damage, as the punch is incluse for the mark. I believe it is PMD by looking at the damage...
It was counterfeit anyway. :)
The balance should have indicated 31.1 grams rather than 31.2 . Since the magnetism seems to be the indicator for you, is their any coating ( such...
I would try acetone first, but it looks like there is a tiny darker locus in the middle of each yellow mark, which would indicate corrosion/toning...
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