The most authentic Yixing purple sand belongs to the Yixing Zisha Craft Factory. Their registered trademark is Fangyuan brand, which has been around for a long time. It should have been used in the 1980s! Like many state-owned enterprises, the Zisha Craft Factory did not escape the tragic ending of bankruptcy, but the centuries-old pot-making craft has not been extinguished. On the contrary, many private handicraft workshops have been born, making exquisite and exquisite purple clay pots, which is gratifying