From Wu Chuan: "It was painted on bamboo and silk by Dan Qing."

Dan and cyan are two colors, which are bright and not easy to disappear, which is a metaphor for constancy; Bamboo and silk are bamboo slips and white silk used to record confessions in ancient times, which are light and artistic, but because the merits of bamboo and silk refer to the merits that can be recorded in history, they are also atmospheric. When drawing bamboo silk, the words are all elegant and elegant, which is more appropriate.

But it also depends on age, and it can also be called "bamboo silk"