Glass noodles
transparent noodle made from starch

Glass noodles, or fensi (traditional Chinese: 粉絲; simplified Chinese: 粉丝; pinyin: fěnsī; lit. 'flour thread'), sometimes called cellophane noodles, are a type of transparent noodle made from starch (such as mung bean starch, potato starch, sweet potato starch, tapioca, or canna starch) and water. They originated in China. A stabilizer such as chitosan or alum (illegal in some jurisdictions) may also be used.
They are generally sold in dried form, soaked to reconstitute, then used in soups, stir-fried dishes, or spring rolls. They are called "glass noodles" because of their glass-like transparency when cooked.
Glass noodles are not the same as rice vermicelli, which is made from rice and white in color rather than clear (after cooking in water).
Varieties
Glass noodles are made from a variety of starches. In China, glass noodles are usually made of mung bean starch or sweet potato starch. Chinese varieties made from mung bean starch are called Chinese vermicelli, bean threads, or bean thread noodles.
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