Developing chemicals use the latent image specks to build up density, an accumulation of enough metallic silver to create a visible image.
2.
So the paper is now placed in the developer, which transforms the silver halide particles that have a latent image speck on them into metallic silver.
3.
These are stable, sub-latent image clusters that subsequent photoelectrons from exposure to light can build into a several-atom latent image speck that catalyzes the development of the whole silver halide crystal.
4.
Silver iodide is always combined with silver bromide or silver chloride, except in the case of some historical processes such as the Becquerel method, in which exposure to strong red light, which affects only the crystals bearing latent image specks, is substituted for exposure to mercury fumes ).
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