Chlorine decomposes it and sets the iodine free, and chlorohydric acid converts it into a chloride.

It fuses below a red heat.

Although the effect of light on the iodide is less rapid than on the chloride, the former sooner turning black, assuming a brown tinge; but when in connection with gallic acid and the ferrocyanate of potash, it forms two of the most sensitive processes on paper.
Iodide of silver dissolves easily in a solution of iodide of potassium, and the liquid deposits in evaporation crystals of a double iodide.
Iodide of Gold .-- If a solution of potassium be added to a solution of chloride of gold, a precipitate of iodide of gold takes place, soluble in an excess of the precipitate.

A little free potash should be added to combine with any iodide that may chance to be set free by the chloride of gold.
Iodide of Lime is prepared by adding iodine to hydrate of lime (which will be referred to farther on) until the mixture assumes a light yellow shade, when wanted for combinations with accelerators, or to a dark brown when employed for the first coating.

This latter mixture has been sold in our market under the name of "Iodide of Brome." Iodide of Bromine .-- (See page 76.) Experiments with Iodine .-- Place a plate which has been exposed in the camera over the vapor of iodine for a very brief period, and it will present the appearance of the impression having been solarized.
b.