http://www.attilacoins.com/Calculate_Specific_Gravidity_coin.asp SG of some alloys, calculated values (Gold with copper, Silver with copper, Copper with Zinc and Copper with Tin) Purity 100% Purity 98% Purity 90% Purity 835% Purity 75% Purity 50% Gold 19.30 19.09 18.26 17.59 16.71 14.12 Silver 10.49 10.46 … Continuar leyendo How to Calculate the Specific Gravity of a Coin