1. If there is no starch, flour can be used as a temporary substitute, but the effect is far less than starch.

2. Flour can be used as raw material to quickly make starch. The method is:

(1) Wrap the flour in fine gauze and wash it in water. A lot of white pulp will wash out.

(2) Clarify the water, pour out the excess water, and the remainder is water starch.

(3) You can also precipitate the water used to wash potato shreds (slices) to obtain starch.