The false black widow is a purplish-brown color (there’s a picture of it in the first link below). It isn’t poisonous like the black widow and isn’t nearly as aggressive. They are the same shape and size though, but the markings on the false black widow are much harder to see, and they don’t have the bright red hourglass trademarked by their poisonous cousins.
Yes, the purplish brown spider has its colour as a protective means of disguising itself in order not to be identified by predators.
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