As to color blems, the only ones I can remember were for two cases.
One was for phasing, where the ball had a lot of white areas that shouldn't have been there. The ball was supposed to have been a solid blue and ended up with a mixture of white in it.
The second was a ball that was supposed to have been a mixture of two or three colors swirled together, but ended up with all of the black in one half of the ball. The other half of the ball was mainly red.
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