You can use sticky rice flour or the following kinds, which are better than corn starch. 1 Mung bean starch Mung bean starch is the best starch, which is rarely used. It is made by soaking mung beans in water, grinding and precipitating. Features: sticky enough, small water absorption, white and shiny color. 2 potato starch potato starch is a commonly used starch in the family at present. It is made by grinding potatoes, washing them and precipitating them. Features are: sticky enough, fine texture, white color, luster better than mung bean starch, but poor water absorption. 3 Wheat starch Wheat starch is precipitated from wheat bran after washing gluten or made of flour. The characteristics are: white color, but poor luster, not as good as potato powder, easy to precipitate after thickening. Sweet potato starch is characterized by strong water absorption, but poor viscosity, dull color, dark red and black, and is made from fresh potatoes by grinding, rubbing and washing, and precipitation.