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The pyramid is just a system of honing with two different grits. It was developed to establish a nicely polished bevel off the Norton 4k/8k (even though it can be modified to suit othe stones) while...

Tim, this was your post #666 :eek:

Welcome aboard. I guess you were looking at Thiers-Issard blades. AFIK they're still carbon steel blades. The silver part could be just from the finish they put on them or other alloying elements...