Are old glass beads valuable?

Old glass beads are very valuable. The history of traditional ancient glaze making in China can be traced back to the Western Zhou Dynasty. Glaze has a variety of colors, and the ancients also called it "five-colored stone". By the Han dynasty, the production level of glaze was quite mature, but the smelting technology was in the hands of royal nobles and kept secret. Because it was hard for people to get it, people regarded glaze as more precious than jade at that time. Precautions for maintenance: Do not collide or move by friction to avoid surface scratch. Keep the room temperature, the real-time temperature difference should not be too big, especially don't heat or cool yourself. Don't put the plane directly on the desktop, it is better to have a gasket. It should be wiped with pure water. If tap water is used, it should be left standing for more than 12 hours to keep the glass surface bright and clean, and oil stains and foreign objects are not allowed. Avoid contact with sulfur gas and chlorine gas.