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The manmade abrasives were in the grade range of 2F-4F and at the end the finest was 1200F. But that is a bit misleading because during the process of making a hone the mixture of abrasives and...

The colorings come from various minerals that are added. A reddish tone is made from iron oxide. There is also a yellow iron oxide. The deep blue is also a primary color but I do not know what...