Turquoise is a copper-aluminum silicate mineral and also contains iron. The main elements that make turquoise blue or green are copper and iron. When copper is dominant, the color is blue, and when iron is dominant, the color is green. Turquoise is a silicate mineral, which has water absorption, and it is not high porcelain turquoise, which is easy to lose water and become lighter in color. During the game, the sweat on the hands seeps into the cracks of turquoise, which deepens the color of turquoise and shows the color of turquoise itself. We call it discoloration, but it's not discoloration. This is the principle of turquoise discoloration.

Raw turquoise will absorb human sweat and oil in the place where it touches human skin, and its color will deepen, while the place where it doesn't touch the skin or play with it is relatively lighter, which is the primary stage of turquoise discoloration. At this time, if you soak in water, the place where you touch the human skin will not absorb water, because the oil of the human body seals the pores and keeps its existing color, just like having a protective film, but the place where there is no disk will absorb water and produce color difference. In the middle stage of some dishes, the place where the raw ore turquoise touches the human skin is sealed with grease, and the water inside the turquoise is lost through other areas, but the external water can't enter, so the color of the turquoise will look pale because of lack of water. At this time, it is normal that the place where water touches the skin will even look pale. Continue to play, when the turquoise absorbs enough oil, the whole plate is transparent, and the dehydrated vacancy is filled, the color will turn deeper.

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