In several reactions a colour change indicates the formation of new products. For example, green copper carbonate reacts, when heated, to form black copper oxide and carbon dioxide gas.
在一些反应中颜色会发生变化，它表明产生了新的物质，例如，绿色的碳酸铜在加热时会分解为黑色的氧化铜和二氧化碳气体。
If you cool it too quickly, the black oxide will stay stuck to the copper.
如果你冷却太快，黑色氧化物将继续坚持铜。
The main compositions of black coloring films of brass and tin surfaces were deduced through the EDX analysis. The black film on brass should be constructed mainly by copper oxide, and that o...
通过电子能谱分析着色层表面，推断出黄铜的着色膜主要组成为氧化铜，锡的着色膜主要由硒化铜和硒化锡构成。
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