When making hand-made cold powder, a proper amount of lime water clarification liquid is usually added. This is because the ice powder is made from brown seeds of fake Physalis alkekengi. The seeds contain a lot of pectin, but this pectin is not easy to form a gel in water. At this time, adding a proper amount of lime can make calcium ions in the lime attract free carboxyl groups in pectin, so that pectin chains can rely on calcium ions to form a so-called "egg lattice" structure, thus greatly improving the compactness and solidifying the original loose pectin together.

To make tofu, put brine or gypsum powder in a proper amount.