Yet another please identify my hone-thread

[Magpie]

You might damage the stone. SiO2 acts as an acid, and they might react. Better safe than sorry, use something milder like soap instead.

I've got a little degreaser left over from the good old days before everything went environment friendly. That stuff takes rattlecan paint off and goes thorugh the bottom of plastic soda bottles given a few weeks ( had alot more before I figured that out). To my eyes the stone looks like its showing the natural color, but if you think it's colored by oil I'll hit it with that degreaser and we'll know for sure.

If I'm not mistaken, Gsssson is talking about Carbon Tetrachloride or maybe Trichlorethylene Shouldnt damage the stone at all, but will certainly damage the lungs, liver, and braincells!