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Here is some other information about the purity of Chromium Oxide I use from Handamerican. I talked to Keith this morning and he sent me this.

Hope this helps.

the chromium oxide with...

I have used Crox from several different suppliers. The best I found was the one from Handamerican, and I use it exclusively on the Hard Balsa Strops I sell. Because of its purity, 99.9%, it seems...