Brown Tarnish works on metal alloys such as copper, brass, and bronze to produce a rainbow brown in a matter of seconds. The colors range from a light tarnished penny brown to a very dark near black shade of brown. Copper and copper alloys can be darkened, or darkened and then burnished for a natural antique effect. The longer the part is in contact with the solution, the darker the tarnish. The process can be stopped at any point simply by rinsing the darkened part with water. As a result, the user has the ability to effect multiple shades of brown using just one solution.