I has to be !
Let me say why, as a Dry Plate practitioner and Jason's protective customer...
When making emulsions the challenge is to make it sensible to green and red. Silver halide crystalls are sensible to blue and UV, very specific sensitizers have to be added to make it sensible to red. In fact those added sensitizers (particular aniline dyes for example) capture the photons and deliver the energy to the attached silver crystals, this is the way it works, as the crystals are not sensible to green and red, as only Blue an UV have energy enough to trigger a change in the silver halide crystal. So if maufacturer knows very well it...
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