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Powdered black crystal Potassium Permanganate sold in 4 ounce bags with instructions. This material should be mixed with water for instant antiquing of natural materials. Works especially well for bone and antler, and works well on some woods. It will also stain your skin a horrifying brown, which should disappear within a day. DO NOT ALLOW CONTACT WITH SKIN, EYES, OR MUCOUS MEMBRANES. Potassium Permanganate is a powerful oxidizer that is used in the water-purification industry. This material requires use by an adult. #136- KMnO4 Potassium Permanganate 4 oz.......$8.00/ea