Exposure (toxicology)
The toxin's pH is also important.  For example, if a toxin is a strong acid or a strong base, it can cause severe chemical burns to the eyes and skin.p. 100  Toxins that have a more neutral pH can still hurt the body by being absorbed into the bloodstream, but they will not burn the eyes and skin.  For example, if a person swims or bathes in water contaminated with cholera toxin, the toxin can still get absorbed through his eyes or skin.  However, the water will not burn the eyes or skin.