Cai Lei carefully analyzed the composition of the urine of the human fear, and found that in addition to its tastelessness, its composition is very similar to that of hydrofluoric acid.

Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas, as an acidic substance, it has a lot of corrosive effects on clothing, skin, eyes, respiratory tract, and mucous membranes of the digestive tract.

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