配方类型:

METALS AND THEIR TREATMENT

配方说明:

Cleaning Old Coins

配方组成:

配制方法:

Use a small stainless steel pan as an anode and the corroded coins as cathodes. The pan is filled with a 2% solution of sodium hydroxide, and the coins dangle from alligator clips into the bath. When a direct current from a small battery charger (12 volts, 950 milliamps) is applied across the circuit the coins literally clean themselves.