I think as PC does, it could either be from lack of grit grinding up the sharp parts, OR it's dye. Birds do poo out dye when they eat an excess of it. Think of purple bird poo on your windshield when berries are ripe in your area....it's kinda funny it's like ya know wha hte birds are eatin a lot of LOL!!!!
I'm sure it's nothing to worry about
I'm sure it's nothing to worry about


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