The Tang trio-color potteries, or "Tang San Cai" in Chinese, was a famous technique for glazing ceramics with three colors -- yellow, green and white or very occasionally blue. It flourished in the Tang Dynasty (618-907) and disappeared in late Song Dynasty (960-1279). The process of firing tri-colored glazed pottery was very complex, requiring dozens of procedures. The past few years witnessed the reviving of tri-colored glazed potteries and replicas of high quality.