1. oxidation of jade in air: jade will be weathered when exposed to air, and the main change is oxidation. The weathering or discoloration of jade in the air depends on the fineness of the material. The weathering of hard and fine jade materials is small or unchanged, while that of loose jade materials changes greatly. Moreover, the discoloration process of jade when it is oxidized in the air is very slow, and this color often appears on some white jade and sapphire products.
2. Color change of jade in tombs: Ancient jade unearthed in ancient tombs often has color change, which is due to the erosion of chemical components contained in funerary objects in tombs or chemical components in soil, so it is called Qin color.
3. Human factors: After a certain period of artificial rubbing or long-term contact with human body, the surface luster of jade will be more moist and the transparency will be slightly stronger, especially for some buried ancient jade, and the color will change after rubbing. The red color of some jade is gradually transformed into ripe red after being immersed in the ground and rubbed, and some are like bloodshot.
4. Contact with human body: Due to the influence of human body temperature and other factors, jade will be worn for a long time, and tiny cracks will gradually appear on the surface. At this point, the tiny particles in the cracks will turn red after oxidation reaction.
These are the reasons why jadeite turns red for your reference. If in doubt, you can consult a professional for accurate information.