I'm a knife making hobbyist. I have seen some of the knife makers use stainless steel fittings (not blades) with a dark blue-green colour on their knives. How does one achieve this dark blue-green coulor?
Stefan Diedericks - Brits, North west Province, South Africa
Blue colour for iron and steel: copper nitrate [affil link]...50 gm manganese nitrate...50 gm water 1 lit Hot immersion (50 °C,only grease and oxide free objects can be treated)! You can take up to 75 gm manganese nitrate !
Budija Goran - Zagreb, Croatia
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