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Coloring of stainless steel

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
2003

Blue colour for iron and steel: copper nitrate [affil links]...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
2003

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