EZ-100 is a Phenolic Syntan Tanning agent. It is a highly concentrated powder that costs less, tans more, and produces a high quality, white, soft, stretchy leathered skin. EZ-100 tanned skins have negligible shrinkage, and are even washable! Environmentally EZ-100 should be your choice! It contains no metals! EZ-100 tanned skins or capes have an indefinate shelf life, and will not deteriorate or weaken with age. EZ-100 is compatible with almost all pickling acids.