Professional platers often use some sort of black lacquer over gold to give it an antiqued look. I know they tumble it but I wish I knew what they used on top, and what type of medium they use in the tumbler. Can you help?
There are several ways you can add an "antique" finish to karated gold, such as 14K.
Left in a strong, hot, liver-of-sulfur bath, karated gold will oxidize. You can also submerge hot gold in ammonia. The ammonia solution works best at room temperature, producing a black patina appearance.
Tumbling the gold afterward should remove any excess patina and give the piece a nice, high-polish finish without removing the patina. Just use stainless steel shot, water and a squirt of liquid dishsoap. If you buff the piece using a rotary buffer, the patina will be removed wherever the buffing wheel is applied to the metal.
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