The chemical reactions described above can be written in atomic symbols as follows: The result is a compound called brochantite, which varies in color from shades of dark green to emerald. The third reaction that influences the color of patina is when four molecules of copper oxide from Equation 2 reacts with one sulfate molecule and three water molecules (Equation 6).
The result is azurite, which is a compound that varies in color from shades of blue to shades of purple. The second reaction that adds to patina’s color is when three molecules of copper oxide from Equation 2 can react with two molecules of carbon dioxide and one molecule of water (Equation 5). The result is a compound called malachite (Equation 4), which varies in color from shades of dark green to shades of blue. The first reaction that gives patina its color is when one molecule of carbon dioxide and one molecule of water, both in the air, react with two molecules of copper oxide on the surface of the copper. It contains carbon dioxide, which we breathe out, along with water vapor. The greenish and blueish colors of copper’s patina come from the next set of reactions.Īir contains more than just the oxygen that we breathe. If sulfur is present on the surface of the copper, then the two can react to form copper sulfide, which is black (Equation 3). This copper oxide from reaction 2 is the main culprit that will later form the colors of the patina. The copper dioxide then reacts with more oxygen to form copper oxide (Equation 2). Both happen when oxygen in the air interacts with the metal atoms in the presence of water.Ĭopper reacts with oxygen that is in the air, resulting in copper dioxide (Equation 1).
The Chemical ReactionĮver ask yourself, “Why does copper turn green?” The formation of patina on copper is similar to the formation of rust on iron. This knowledge will also allow you to influence what color of patina forms, and how fast it will do so. Knowing how copper patina forms will give you a deeper appreciation for the unique patina that appears in your family's history. The shades of patina that form on the surface of a copper furnishing can store the memories of meals, spills, new homes and life changes over the course of centuries.Ĭopper is more than a shiny metal - it is one that can be adorned with beautiful carvings that tell a story. The natural changes that happen to copper objects make them a one-of-a-kind symbol of heritage that's hard to replicate. The beauty of copper is unique among decorative materials because the changes it undergoes are unique to each home and location. The emotions are sometimes so strong that I work without knowing it. I saw the angel in the marble and carved until I set him free.
Inspiration does exist but it must find you working.
PATINA GREEN PANTONE CODE
#b9eab3 HTML / CSS Code Examples #b9eab3 foreground #b9eab3 linear gradient to complementary #f99eff This color has an approximate wavelength of 552.21 nm.īuy paint matching this color Color Variations In the HSL color space #b9eab3 has a hue of 113° (degrees), 57% saturation and 81% lightness. In the RGB color model #b9eab3 is comprised of 72.55% red, 91.76% green and 70.2% blue. The hexadecimal color code #b9eab3 is a light shade of green. Pantone / PMS 12-0225 TCX / Patina Green / #b9eab3 Hex Color Code Pantone / PMS 12-0225 TCX / Patina Green / #b9eab3 Hex Color Code, RGB and Paints
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