Q:

What color are silver bromide and silver iodide precipitates?

A:

Quick Answer

Silver bromide is off white or cream colored, while silver iodide is yellow. These two solids are insoluble in water and darken when exposed to light.

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Full Answer

The substances darken upon exposure to light because they are converted to fine particles of metallic silver. Tiny metallic particles absorb rather than reflect light. They also appear black instead of shiny.

This light sensitive property was utilized to produce black and white photography. Silver bromide was the light sensitive compound on film. Areas of the film exposed to light would darken, creating the negative.

Today, the same process is used to create photochromic or Transitions lenses for glasses.

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