![]() ![]() TemperatureĬhemical reactions happen when molecules move and collide with each other. This knowledge will surely impress your friends and relatives as they marvel at the elegance of your copper and the sophistication it brings to both your home and your conversations. Knowing these factors will not only help you appreciate the patina on your copper but will also allow you to influence how the patina forms. Several factors in the copper and the surrounding environment can affect how fast patina forms, and what colors it will have. ![]() The faster a chemical reaction is, the more products will form. Why does copper patina over time? As we have established, patina forms on copper because of chemical reactions. Shellfish, such as crabs, have greenish-blue blood because the metal atom that carries oxygen in their bodies is copper. It is interesting to note that human blood is red because the molecule that carries oxygen in our blood is iron, which produces a red color. When mixed in small amounts and held on the surface of copper, these three compounds produce the pleasant luster of patina. Each of these three compounds can form beautiful crystalline structures on their own, like precious rocks. Darker greens indicate an abundance of malachite and brochantite, while blues suggest that azurite is abundant. The products that result from Equations 4-6 in the previous section each has their own shades of color:ĭepending on what combination of these three is present, the color of the patina can vary from shades of green to shades of blue. This section describes in broad terms why the presence of certain chemical compounds can affect the green and blue hues often seen in patina. The next section explains the physics and chemistry of why the colors of patina can vary so much from place to place and from time to time. Patina has different colors and patterns that depend on the unique experience that each copper object has had.
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