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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
-----
Blackening of brass and copper at room temp
I want to know how to blacken brass and copper at room temp, blackening of iron and steel and also green patina on brass.
Vineet LohiyaSURFACTANT INDUSTRIES - JODHPUR, RAJASTHAN, India
2002
See letter 36214.
Dan Brewerchemical process supplier - Gurnee, Illinois
2002
2003
Black for copper and brass:
200 gm copper carbonate
⇦this on
eBay
or
Amazon [affil links]
1 lit ammonia
⇦this on
eBay or
Amazon [affil links] 25% Cold immersion!Work outside or you need strong ventilation!1-4 min.
Green for brass:
200 gm copper chloride
100 gm potassium chloride
1 lit water Black for iron and steel:
20 gm tannic acid
⇦this on
eBay
or
Amazon [affil links]
20 gm tartaric acid
⇦this on
eBay
or
Amazon [affil links]
1 lit water Only grease and oxide free objects can be coloured!
- Zagreb,Croatia
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