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。
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.
以二氧化钌和氧化铜的混合物为功能相制备出不锈钢基厚膜PT C热敏电阻浆料。
The thick film PTC thermistor paste based on stainless steel was fabricated using the mixture of RuO2-CuO, as the conducting phase.
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