This is the true hard fact, don't change your natural red hair.
这是千真万确的事实,不要改变你天生的红头发。
英语百科
Carminic acid
(重定向自Natural Red 4)
Carminic acid (C22H20O13) is a red glucosidal hydroxyanthrapurin that occurs naturally in some scale insects, such as the cochineal, Armenian cochineal, and Polish cochineal. The insects produce the acid as a deterrent to predators. Carminic acid is the colouring agent in carmine. Synonyms are C.I. 75470 and C.I. Natural Red 4.