Purple has been a noble color since ancient times.

Traditional Chinese plants used to dye purple include lithospermum, perilla, mulberry, hyacinth, wild amaranth, malabar spinach, grape skin, blueberry, etc. In the 16th century BC, the Phoenicians on the eastern coast of the Mediterranean first found natural purple-red dye in bone snails. In the Spring and Autumn Period, lithospermum dyeing flourished in Shandong, China. According to the book "Tiangong Kaiwu," adding lithospermum juice to the ink-making process can make the ink red. Purple is often associated with auspiciousness and nobility, and has always been a symbol of luxury. Duke Huan of Qi liked to wear purple. "Tang Huiyao" says "officials of the third rank and above wear purple," and the Song Dynasty had the saying "the whole court is full of noble people, all of whom are scholars." In the Middle Ages, only the Virgin Mary, angels, and the Pope wore purple; Queen Victoria of England was also known for wearing purple. Monet discovered that fresh air is purple.