Considering that silver and other camera colors are outsiders, I wonder if there is a specific reason to make black camera bodies.
I can think of several "marketing" reasons (discretion, first, or aesthetics - black is posh), but I wonder if more technical aspects play a role here, or on the contrary if the makers don't take some effects of the color into account to privilege design.
For example, black is probably pretty bad for the thermal protection (on hot days, the temperature of the body can jump due to light incidence), but good to avoid reflections. These are random thoughts...
Then what is the influence of the body color on the optical and mechanical system, or on the imaging process generally speaking? If there are sources somewhere explaining these aspects, that would be nice.