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Green verdi and blue verdi patina solution

Can someone give me a "recipe" for the mixing of what chemicals to spray on reactive metallic paint (or metal) to produce the green verdi and blue verdi patinas? What name do I ask for and what strength? I am assuming that it comes in a powder of crystals that I will be mixing with water. Thanks. Some of the search engines have given me such names as liver of sulfur [on eBay or Amazon] , tourmaline, copper sulphate [on eBay or Amazon]and ammonium sulphate [on eBay or Amazon] .

Paulette Esselman
Extraordinary Walls - Grapevine, Texas
2005

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