Maybe it's colour dependent. I've got the browns and blacks and they all have it (and according to a source, they are undyed...brown comes from brown sheep and black comes from black sheep). I just picked up a lovely red and a green (both heathers) and they also both have it.
Tara
Ding! Makes sense, I do buy it mostly from a weaver.
Tara
Mine is blues and greys - beautiful!
Katherine
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