Create a look of naturally occurring patina to nonferous metals( metal without iron using Cool Tools patina gel. The antique coloring solution works for fine silver, sterling silver, sterling silver-filled, copper, bronze and brass metals. Patina gel is liver of sulfur in a stabilized gel form with a  much longer than the chunk form of liver of sulfur and it doesn't degrade in light and air like a lump or liquid forms of liver of sulfur.  Add a small amount of Cool Tools patina gel to warm water and dip or soak items until the desired color effect develops. The gel can also be brushed on items in full strength directly from the bottle. Store in a cool, dark place with lid tightly closed.

cool tool liver of sulphur gel patina for darkening metals