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Well, it depends on the effect you want. If you etch with the blade on its spine only, you end up with a tiger-stripe effect. I think it's because the bubbles coming off the oxidizing steel have...

I have noticed a similar effect when I was etching razors--the one-sized thing, that is. I think it has to do with bubbles getting trapped on one side of the blade or something. Anyway, if one side...