This has led to the production of all kinds of organic and metallic dyes. However, these dyes are less than ideal in both the duration of their effect and the depth of color that they produce.
於是各式植物性或金屬性染劑應運而生，但持久性和色澤都不盡理想，含金屬性的染劑甚至造成頭髮斷裂的問題。