Blue and white porcelain is an underglaze color, which is the most environmentally friendly and has no toxic substances. It has been used for hundreds of years in history. Poisonous is glazed porcelain, which is colorful and beautiful. Toxic substances will be released at high temperature.
It should be noted that the real underglaze color is more valuable, and 56 pieces are cheaper, which is also more than 1500 and 3 4000. There are many underglaze colors and underglaze colors on the market now.