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Thank you all for the help ! The swirls are indeed yellowy/orange. The slurry don't smell like mud, i'll say it's smell like iron although i'm not a very good with smells.
One more question:
Is the...

Yes, like coticules but the black side is rough, under 1k and I believe is not is natural!
One photo with the back of the stones:
155781

Thanks for the help. I'll send a mail to Hank Bos in a couple of hours when i get home.
I don't think the stones are JNS. I forgot to mention that the smaller stone is glued to a rough black stone

I've got them from Spain from a recently closed barbershop.

Hello,
Please help me ID these stones! They are quite heavy and very hard to lap, after one hour of work with an Atoma 400 i can say I'm in the middle of straightening proces.
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