Silver Iodide Colour

Silver iodide is a chemical compound with the formula AgI. It appears as a yellow, crystalline solid at room temperature. However, when exposed to light, silver iodide can undergo a photochemical reaction that causes it to turn dark grey or black.

The reason for this color change is due to the formation of tiny silver particles within the crystal lattice of the silver iodide. These tiny particles absorb light, giving the material a darker appearance. The exact size and distribution of these particles can vary depending on factors such as the amount of light exposure and the temperature of the material.

In addition to its use in photography and cloud seeding, silver iodide has also been studied for its potential as a material for solar energy conversion. When exposed to light, the silver particles formed within the crystal lattice can act as electron traps, which could potentially be harnessed for generating electricity.