A chemical (typically a solution of sodium hypochlorite or hydrogen peroxide) used to make materials whiter or for sterilizing drains, sinks, etc.
It is a heavily corrosive material capable of irritating the eyes, skin and respiratory tract often by simply inhaling the gases its use emits. This inhalation has been noted to deteriorate the lungs and esophagus lining in addition to the scarring of the respiratory tract that I previously mentioned. These side effects may not occur to a visibly notable extent with each exposure to bleach, but the chemicals impact is never favourable, especially over a long period of time.
