Just thought this was (slightly) interesting. It’s Jayo’s “Easy ABS” - weird stuff, not really like ABS at all. It’s very tough, but with poor temp resistance. If you bend it in half, if changes colour very dramatically
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Real ABS turns white/grey too, from both stress and acetone (in liquid form, vapor does not seem to discolor it).
Most plastic lightens and becomes “milky” when stressed.
I’ve seen that a ton with injection molded plastic, but I don’t know if I’ve ever seen that happen on a printed part before. My prints usually break before deforming enough to get discolored.