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Etching Damascus
Ed has given lots of GOOD info on how to etch Damascus and that's what I follow. I even made a FeCl tank with PVC pipe and cap that's clamped next to my work bench.
My question, with a billet (not HT'd) does it help "set" the black oxide to make it stay "blacker" if the billet is baked for a while - say around 300°F or so. Fresh out of the tank the black is so easy to wipe off. I tried baking a billet, then "washed" gently with 1200 grit sandpaper (wet) to bring out the bright of the 15N20 and baking did "seem" to help - was that my imagination? OR, did baking actually help?
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