In order to determine the authenticity of the purple casserole, look at the color: pure purple, whether the color is purple, yellow, red or somewhere in between, it should have an emerald-like charm. Sadly, the quality of light is more like oil friction than the effect of wax, polishing, reference materials and old jade, and rarer materials, because limited resources are more valuable. Look at the feel: the feeling of purple should be smooth, round and comfortable. Although it is granular, it is round.