If the part is small enough, I use a large sealed mason jar to perform the process. Zinc Removal: Dip your part in a glass or plastic container of Muriatic acid, the reaction will be immediate (fizzy) and should only require a minute or two to complete the process. Perform in a well ventilated area, protecting yourself from contact with the acid. NOTE: The zinc removal procedure has an intense reaction, and produces hydrogen gas (explosive). If the materiel is galvanized (zinc plated), like the chicken wire shown, the zinc must be removed first before rusting. However, in order for this method to work, the material must be unprotected (exposed iron). To preserve the patina, the part should be top coated to prevent air from reaching the metal (see topic).Ī bit of rust can add some ‘rustic’ years to the look of you project, and this method is quick and easy.
(5) Oxidation will continue to occur over time if exposed to the air. Once dry you can manipulate the result if desired (sand, scrape, steel wool, etc.).
(4) The new patina is delicate, allow to air dry for at least 24 hours before handling. (3) As an option, to expedite the process or to create a thicker layer, I either seal my part in a clear airtight container to concentrate the reaction, and I might also add some ammonia (see above). Miracle-Gro contains ammonium phosphate so the reaction is similar, but less intense, to the ammonia method above… (2) You can spray or wipe the solution onto your part, in the open air a patina will begin to form within 30 minutes. If you are going to spray it, make sure the Miracle-Gro is fully dissolved in the solution. (1) For a blue patina, mix 1 part Miracle-Gro with 3 parts water, or for a greener result substitute the water for red wine vinegar.
#TRIM COIL PATINA GREEN FREE#
Make sure that the material is clean and free of surface oxidation. Miracle-Gro plant fertilizer is my favorite oxidizer for brass, copper, and bronze. To preserve the patina, the part should be top coated to prevent air from reaching the metal (see topic). (8) Oxidation will continue to occur over time if exposed to the air. (7) Once dry you can manipulate the result if desired (sand, scrape, steel wool, etc.). (6) The new patina is delicate, allow to air dry for at least 24 hours before handling. (5) Monitor your part, add additional salt mist to achieve the desired result. (4) The material should not be touching the ammonia, the reaction comes from the vapors. (3) Seal your part in a clear airtight container, suspending the part over liquid ammonia. (2) Sprinkle some dry salt grains on top (optional). The key with this method is to spray the material with a salt solution mist (avoid rubbing it on). (1) Mix a solution of saltwater in a spray bottle, adding as much salt as the water can dissolve. Make sure that the part is clean and free of surface oxidation I use 0000 steel wool to polish the material before application. Gather all your materials before you begin.
This method tends to produce a unique outcome each time, resulting in a mix of colors and patterns. The three (3) main compounds that are responsible for the later stages of green / blue patina are Brochantite, Malachite, and Azurite. The timing and color composition depend on the location and atmospheric conditions (ratios of sulfur, water, sodium chloride, carbon dioxide, oxygen, etc.). The colors range from a shiny pinkish red, to brown, black, and eventually to different shades of blue, purple, and green. Although these reactions have all kinds of fancy names like copper oxide, copper dioxide, copper sulfide, copper carbonate, etc., the interesting part is the dramatic change in color throughout the process.
#TRIM COIL PATINA GREEN SERIES#
The Statue of Liberty was not always green - through a series of complex reactions, it took over 30 years for her to evolve into her current appearance. It is also referred to as a ‘passive layer’ which protects the statue from further oxidation. This final stage of oxidation is referred to as verdigris, which means ‘Green of Greece’ in Old French. Since most of us are under the age of 100, we think of the statue in its current color, a pale blueish green. Probably the most famous example of copper oxidation is the Statue of Liberty, gifted to the United States by France in 1885.
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