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Presumably to minimise reflection of UV, without being so dark as to cause visibility problems (as red would). I have my doubts it's actually necessary though (the dark rooms I've been in have been painted white as far as I know... although it's hard to be certain since they always had yellow light on at the time 
).
I have been wondering lately if white walls in an exposure room would cause light reflecting and scattering, but I'm guessing they're not reflective enough to really cause much impact?
).I have been wondering lately if white walls in an exposure room would cause light reflecting and scattering, but I'm guessing they're not reflective enough to really cause much impact?
