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Tests for Chlorine

This gas is readily distinguished from other gases by its color, odor, and bleaching properties. Its". aqueous solution dissolves gold leaf, and instantly blackens a piece of silver plunged into it. It rapidly destroys the color of iodide of starch, solution of indigo, litmus, and turmeric.

A simple method of detecting free chlorine is to hold a rod, dipped in water of ammonia, over it, when white fumes of sal-ammoniac will be formed; this, coupled with the property of bleaching colors, may, in most cases,