1. Soaked natural turquoise has strong water absorption. When put into clear water, different turquoise will produce different reactions. Porcelain pine has high density and dense texture, and it will not produce any reaction when put into clear water. Soaking test can also detect the porcelain degree of turquoise. The color of turquoise changes obviously after soaking in water, indicating that its porcelain degree is not high. Second, natural turquoise will turn black immediately after burning, but it will have no effect if it is wiped off in time and washed off with water. The optimized turquoise will give off a pungent smell or a plastic smell. This method is destructive, and ordinary businesses will not let you test it like this. Third, the color of natural turquoise is warmer and the color is very natural; The color of fake turquoise will have artificial traces, and the color looks very uniform. Fourth, look at the iron wire. This method is most suitable for beginners and simple. Most natural turquoise will have some iron wires, and the iron wires of natural turquoise are concave, with irregular and natural lines. However, artificial turquoise, iron wire is basically convex, the thickness of iron wire is very similar, and it looks stiff and unattractive. V. Purple lamp identification method Natural turquoise has no reaction under the irradiation of purple lamp. The optimized turquoise will also show obvious fluorescence under fluorescent illumination, which is why many old players always bring purple flashlights.