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I've seen others before but usually they are more pronounced. This is indeed very gradual. I would almost be tempted to cut it horizontally and see if it is light purple-ish in the middle.
But as it...

Price reduced to 100 with shipping included.

Up for sale is a natural yellow / blue coticule. In other words: the combination yellow / blue is occurring because it was cut from a piece of strata that just happened to be bbw on one side, and...