Have an old family recipe somewhere in storage which was suitable for very small items. From memory the following solutions were used for the process of plating. Silver - double cyanide of silver and potassium. Copper - acidulated copper sulphate Nickel - solution of the single salt of nickel sulphate. Iron - Ferrous chloride and calcium chloride For anything more than the size of a fag packet we would take the item to the electro-plating shop, get them to do everything as per a normal job except polish it. Really cool alloy finish was the result. Patrick