Hexachloroethane, also known as perchloroethane (PCA), C2Cl6, is a white crystalline solid at room temperature with a camphor-like odor. It has been used by the military in smoke compositions, such as base-eject smoke munitions (smoke grenades). ==Manufacture== Hexachloroethane is a byproduct of many industrial chlorination processes. It is curren... Found on http://en.wikipedia.org/wiki/Hexachloroethane