Good quality purple ghost crystal is clear, poor quality purple ghost crystal is turbid, and fake purple ghost is flawless; To the touch, the good quality purple ghost tentacles are cold and wet, the poor quality purple ghost tentacles are blocked, and the fake purple ghost tentacles are warm and dry; Purple ghosts with good hardness and quality are not easy to leave scratches on the surface, while purple ghosts with poor quality have obvious scratches, and fake purple ghosts will have scratches.