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In 1881, at age 17, Louis discovered a way to capture images on dry plates with gelatin silver bromide.

What some people don’t know about film is that it’s coated with a thin layer of silver chloride, silver bromide or silver iodide.

The relation of the gold to the potassium bromide, as well as the amounts of silver and silver bromide which are equivalent to the potassium bromide, were determined.

Let remain two or three minutes after transparency is cleared of all appearance of silver bromide.

A. Werner determined the molecular weights of mercurous, cuprous and silver bromides, iodides and chlorides in pyridine solution, and obtained results pointing to the formula HgCl, etc.