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Howard,

My yellow green came with a rubbing stone of the same material though of a slightly lesser quality (with a few gold-coloured (pyrite?) inclusions on one side). I am not sure what effect...

Hydrophobic or not: it does a good job on my razors so I'll keep using it with water. As you should be able to use them both with water and oil acoording to, I believe, older labels by Escher I am...

Now that we seem to have many experts on Eschers together I have one question: my Y/G Escher seems to be a bit greasy. If I put water on it the drop does not spread, if I try to spread it evenly over...