With yam starch leakage powder, you must first play ow, every hundred pounds of starch to play ow four pounds (to be cooked in boiling water). And use alum three two mixed into the owe (punch owed to add alum), followed by owed and starch into a lump, digging a piece of hand into the leakage of powder scoop, knocking the powder scoop, leakage in the boiling water cauldron, that is, into the cooked vermicelli, fished out of the drying bundles, that is, into the dry vermicelli storage and transportation or sale. In the next three years of leakage of powder, for your reference.