Natural pigments can be divided into three categories according to their sources: plant pigments. Such as 1 1r green in green leaves, carotene (orange yellow) in carrots, lycopene (red) in tomatoes, etc. Animal pigments, such as heme (red) in muscle and astaxanthin (red) in shrimp shells; Microbial pigments, such as monascus pigment (red) on the surface of soy sauce tofu.

According to its structure, natural pigments can be divided into six categories: porphyrin derivatives, isoprene derivatives, polyphenol derivatives, ketone derivatives and quinone derivatives. Monascus pigment, monascus yellow pigment, monascus rice, gardenia blue pigment, gardenia red pigment, cocoa pigment, Phaffia yeast pigment, bamboo yellow pigment.