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I don't think the etchant has much to do with making a distinct pattern. Proper heat control and heat treatment and the finishing of the metal prior to etching has a lot more to do with it. Muriatic acid is ACID and, personally, I don't want that anywhere near my blades or even in my shop where the fumes from it will corrode any metal it can find. FeCl is controllable and can provide all the contrast anyone could ask for if you do your work on the damascus correctly......
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