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Is Green patina finish on copper gutters possible in dry climate?

I have a request from a client to put a "green" patina on some copper gutters. Here in Northern Nevada we have very low humidity. Copper turns black. Is there a way to put a "green" patina on copper in our climate that will stay that way or will it eventually turn black again?

Craig Willcut
contractor - Reno, Nevada, USA
2003

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Green patina for copper and copper alloys:

250 gm ammonium carbonate
250 gm ammonium chloride
1 lit water

You can brush it very thinly, on grease and oxide free object. And you must lacquer or wax it (use Incralac ⇦this on eBay or Amazon [affil links] or Renaissance Wax ⇦this on eBay or Amazon [affil links] )!

Goran Budija
- Cerovski vrh Croatia
2003