The specific number varies from person to person, mainly depending on what kind of master you meet, ranging from several hundred to tens of thousands, but the most expensive one is definitely not the best. Cold rice noodles are not difficult to make, but many people don't understand, so there is no need to spend too much money. The main component of cold rice noodles is wheat starch. The higher the purity of starch, the better the quality of cold rice noodles. Adding any other substances, such as sweet potato starch or corn starch, will reduce the quality of cold rice noodles. Find a master of physics and learn it in two days. It's easy.