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I have seen from the same seller TOS stones rated as 15k+ (not WOA, TOS, white, not grey, with the dots) so I'm not sure how accurate is his grit rate system is. The old yellow lake stones, don't...

Those kind of stones do not absorb oil, so, don't worry. Wash them after honing, and if there is still oil on it, give it a very fine lapping. I use WD40 and it's not bad.

Nice answer. There are at least two different kinds of Yellow lake stones, but I have one like the one you have but darker, almost black. No, the purple color has nothing to do with garnets, and on...