I've had plenty of purp that was entirely green. Either they harvested too early or it just didnt come out purple. Either way, its probably still purp.
Most of the TRUE pk I get is not purple at all. But it is nice to look down once in a while and see those almost blackened purple spots on your nugs . If its got that strong hashy/earthy smell, so pungent nothings stopping it, then your smoking some PK