Also, a lacquer will help preserve the color and resist further natural oxidation. That said, you may want to try a tinted lacquer to achieve the proper color, because an oxidizing process to color your zinc sheet will require immersion to achieve color uniformity. The "blue" actually comes from the light reflection of an oil that is applied to protect the black oxide-type finish. The term "bluing" is a generic term used in metal finishing of "steel" parts - most common in the firearms industry. You can probably wipe on a copper-based patina solution with enough effort if that's the look you seek. It's possible to get blue (verdigris?) patinas on copper, brass, and bronze because copper salts are blue-green, but zinc salts are not. The metalworker wants to faux paint it - I hate the idea - why would I use metal to do this? What do I tell him to do? He obviously has no experience in this kind of work. Can it be used on zinc? Can it be done after installation? It seems that most patinas recommend immersion in the chemical, which is not possible in this situation. I wanted a "bluing" finish, and I know there are patinas available that can do this. The metalworker who installed it did not patina it before installation, now is struggling with trying to add the patina in a finished room. I designed a zinc sheet metal ceiling for a powder room at my client's residence. Several threads were merged please forgive repetitiveness, chronology errors, or perceived disrespect towards earlier responses - they probably weren't there then :-) Goran is a metals conservator and seems to always have the answers I don't expect! Thanks as usual, Goran. Thank you, Goran Budija, for those recipes. yellow, 8-9 min.very dark red, without lacquering or waxing! Goran Budija Lustre colors for zinc: NaOH.83 gmĪt 10 ☌ temp., 2 min. ![]() Best regards, james FoxĢ002 Black for zinc: Cu(NO 3) 2.6,25 gmīronze brown for zinc: iron sulphate.50 gmīlue for zinc: nickel sulphate.60 gm Can anyone tell me how I can speed up the process of verdigris on zinc to achieve the green patina one sees on aged zinc clad rooftops. Previous closely related Q&A's, oldest first: 2000 Hope it helps and good luck! Goran Budija Copper nitrate based solution can be used only on copper plated zinc objects (or any other copper coloring solution). Try my download free booklet on metals coloring and plating ( ) ,there you can find small chapter about zinc coloring. When asked for a formula that did not use ammonia, Goran then suggested 300 gram of copper nitrate per litre of water.Ī. Rick Varnum says a spray bottle of blackening solution made for steel will work fine on zinc and, for countertops, should be followed by butcher's wax. Goran Budija suggested 60 grams of nickel sulphate plus 60 grams of ammonium chloride per liter of water. Thank you - yours enquiringly - friends in the UK Man Garnier I have found that zinc solutions will activate zinc very quickly - so I guess a fairly diluted solution is required? It seems no one can give a complete answer? I'm happy to apply two solutions seperately to obtain the light blue/light grey that would suit our zinc topped table. However - flicking the solution from a tooth brush, brush or applied with a sponge (lightly) should achieve a good patina. I would preferably like a mottled effect so a chemical solution would be sprayed from a medium sized garden spray bottle. The last question was to produce a light blue and grey (near enough) patina on a zinc table top.ĭoes anyone know if this request was answered? Copper Nitrate was suggested but what concentration and with any other chemical mixed or would they be applied separately? Did the question asked fairly consistently on this thread ever get an adequate answer? ![]() Plating, anodizing, & finishing Q&As since 1989īlue/green/verdigris patinas for zinc Q&AĬurrent question and answers: May 5, 2021
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