Blak-Ox DRY ® produces a very dark, smooth, deep black patina on silver and gold. Requires the addition hydrochloric acid to the powdered contents.( Hydrochloric acid can be purchased as muriatic acid at hardware and pool supply stores).
Dilute with water for shades of gray.
Works on silver, gold, copper, brass and bronze. Do not use on Aluminum.
Not a hazmat item. Can be shipped by ordinary post.