Acid,the corrosive type.some one asked where would you buy it? who would stock it? what controls do we have on it? not one of us had a clue and yet the substance is causing untold damage to peoples lives.The whole premise of this product and the thought some one could even think of using it other than the purpose it was deigned for sends shivers, surely today we must come down to one thought someone using it is attempting to commit murder and should face the law under the same premise of using a Gun. This product ends the lives of those we have saved and we should treat those who choose to use it with every tool we have under the legal system.