And a side question, how much would those cost, if it's in pure gold?
i'd be more worried about the size then. gold almost 2 times heavier, they would be thinner and smaller if we talk about 1g.
if the weight could be more, let's make them at least 1.55 gram, the diameter could be the same and only have them thinner (not the same volume). dies could be reused (hope so) so the premium could be a hair less % than for silver coins. if the company does also gold coins : )
EDIT it was a cheap test kit I used and showed 90 to 100% silver due to the colour of the liquid. So if anyone knows of a better test kit let me know as I need one for my ebay buys
nay, only cheap kits around. there's an elegant method involving acids, that would separate silver from copper and other base metals and results in silver powder that you can weight. it depends on your skills and tools (precise scales, working methods)
downside is that destroys the coins (or what ever you dissolved) and has some toxic gases as byproduct (to be done rather on balcony or garden then in a cellar). the pH of the waste solution can be easily neutralized and the waste is safe enough to be disposed at a communal recycling facility without alarming the firefighters and police. the base metals can be also recycled from the solution. i don't have the equipment to trustworthy essay the coin (could be 101 % if some dirt makes into the dish with final powder
). mick mentioned the manufacturer, i believe they have a kind of quality control in place and guarantee the silver content