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Ted Mooney, P.E. RET
Pine Beach, NJ

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Green Copper Patina

I desire to treat copper roofing and outdoor lighting fixtures to acquire a green patina without going through the "browning" stage. What chemical may I use to accelerate this process?

Don Kutil
- Troy, MI USA
2003

WHAT CHEMICAL DO I USE TO ACHIEVE THE GREEN EFFECT RAPIDLY ON BRIGHT NEW COPPER WITHOUT GOING THROUGH THE BROWN STAGE FIRST. ALSO, DOES THE CHEMICAL I USE HAVE ANY ADVERSE SIDE EFFECTS WITH ROOF BOARDS, ASPHALT AND FIBREGLASS ROOFING MATERIALS?

DALE PITCHURE
- BATTLE CREEK, Michigan
2003

2003

Green for copper :

3 gm copper sulphate ⇦ this on eBay or Amazon [affil links]
90 gm ammonium sulphate ⇦ this on eBay or Amazon [affil links]
1 ml ammonia ⇦ this on eBay or Amazon [affil links]
25% 1 lit water

Goran Budija
- Cerovski vrh Croatia

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