Shì shuāng (柿霜) refers to the natural, white, powdery crystalline coating that forms on the surface of dried persimmons (shìzi) during the drying process. This bloom is composed primarily of glucose and fructose that migrate outward and recrystallize — it’s not added sugar or mold, but a sign of proper traditional drying. Though visually similar to frost, it has no relation to cold weather; the character 霜 (shuāng) here evokes its fine, powdery texture and pale appearance.

In Traditional Chinese Medicine (TCM), shì shuāng is valued for its moistening and cooling properties, often used to soothe sore throats, relieve dry coughs, or calm lung heat. It’s typically scraped off the fruit and consumed directly, made into lozenges, or added to herbal formulas. Because it’s derived solely from persimmons and forms naturally, authentic shì shuāng is distinct from artificial additives or starch-based imitations.