Simple solution for this.
Use Hydrofluoric Acid. Hydrofluoric acid is a corrosive acid that is colorless and features a strong, unpleasant odor. It's typically used for things like mineral digestion, etching and surface cleaning. The health hazards are based on the type of exposure and the concentration, but it is known to destroy skin tissue and eat through bone. The acid doesn't stop there, it can also eat through metal. For these reasons, the acid must be stored in chemically appropriate containers.
Breaking Bad Style!