A true all in one "DeOldify model" perhaps? Where you just drop any old photo in and in one second it makes it look like it was taken yesterday?pic.twitter.com/dTXXEzkkpS
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It's more specifically unknown/unknowable things, particularly clothing, that get the purple treatment. There's ways to mitigate it and I'm chipping away at it slowly, but it's a very long tail problem. Basically the model is defaulting in these cases to an "average".
Ah! Probably better than defaulting to acid washed denim. 
Well that happens too, embarrassingly enough. I'm sure you've seen that. That's the trade off of using modern images to inform historical colorization.
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