Liver of Sulphur
This 1 oz Bottle of Liver of Sulpher is for coloring metal black.
Works Great on Copper, Silver, and Brass.
Coffee hot water and a few drops of this does the trick.
Add ammonia for killer cool colors, front side down.
Use a dipping style by dipping in liver of sulphur and then cold water to stop the reaction. Back and worth for best results and colors.
Your tomato plants love to drink the water after or use baking soda and flush.
Don't use boiling water or a flame; it will create sulfur-dioxide gas.
Store in indirect light for best storage.