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even and equal scratch marks and an even shine..

The washable will still work, just let it dry a few minutes, so it all doesn't just wash off instantaneously, and don't wet the stone as much, you...

Washables are normally water soluble ink at least for awhile so this would not be the best option on a "WATER"stone...
Permanent marker will come off with Alcohol so even if there is some left on...