Quote Originally Posted by JimmyHAD View Post
I was thinking of that possibility myself, though as of yet I only had a bit of black staining as zib described on his. No yellow yet , but as I noted before, I haven't been using it much.
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The only staining I ever noticed on any stone was some black and yellow stains in the 4k side of my Norton 4k/8k combo. No staining on either side of the Gokumyo 20k.