As the most important step in the production of ceramics, the quality of the porcelain is determined. The first choice of porcelain stone is from the mining area, and the ore is manually broken with a hammer to powder it when it is about the size of an egg. After elutriation, remove the impurities of the ore, rub it with your hands or step on it, and let the air in the mud squeeze out. This step must be done carefully and repeated several times to make the moisture in the mud even. This is the ancient processed ore. This method is more practical and manual. With the development of technology, the manual processing has been replaced, but the method is still the same.