paints are biodegradable as they are water based emulsions. but the emulsion part is partially made up of organic molecules.
as some organic molecules breakdown they produce organic acids; these will eat away at plastic, annodising, pretty much anything.
they also can stain stuff due to the acids being stained the paints colour, there fore when they eat away at your lenses they will leave a stain.
clothes can also be stained due to the organics being often hydrocarbon based. and as most people know oils stain.
as some organic molecules breakdown they produce organic acids; these will eat away at plastic, annodising, pretty much anything.
they also can stain stuff due to the acids being stained the paints colour, there fore when they eat away at your lenses they will leave a stain.
clothes can also be stained due to the organics being often hydrocarbon based. and as most people know oils stain.