1. Many people find it difficult to clean fresh silkworm chrysalis after buying it back. Soak in warm water for a while, then add a little salt to the water and soak for a while. Remember never to use hot water.

2. Also, fresh silkworm chrysalis is always stained with a layer of oil, which can't be washed off. Because fresh silkworm chrysalis contains at least 10% oil, silkworm chrysalis contains oil both inside and outside.