Quote:
Originally Posted by GoldCoinLover  ... how to make your own specific gravity test to figure out metal content ... |
This is not easy. If you like to build things, then, yes, it will be easy for you. If, like me, you do not build well, did not do well in chemistry lab, and pay a mechanic to work on your car, then measuring specific gravity is a headache that results in an inaccurate and imprecise number. When I worked at Coin World, we had a device all built up and ready to go. I spent a year with this, probably weighed out a dozen different coins. When it came time to determine the specific gravity of my own personal ancient electrum coin, I sent it to the ANA and paid them to do it.
That said....
Here is one link:
http://www.lnhs.org/hayhurst/geology...ic_gravity.htm
Here is a different apparatus:
http://en.wikipedia.org/wiki/Jolly_balance 
