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Thanks for the responses guys, BG, Justin was correct, it's strictly an aesthetic purpose, I've seen it done on other blades and was giving it a try An 800 grit hand rub and some darker gray random pattern pop pretty well, I'm going to try some polish to try to even out the etch like John...

Hi All, I etched 6 sample pieces of heat treated CPM154 at different times from 5-30 minutes to see the differences I cleaned surfaces with acetone prior to etch I used straight Ferric Chloride, rinsed, and left in baking soda bath for several minutes The result was nice but still slight...