Gromwell Root P.E GMP manufacturer moq :1kg payment:TT ,L/C Gromwell Pigment ... cultivated in the northwest of China. It is a red purple resinoid liquid. It dissolves in oil and alkaline solution. Its ... is affected by various pH values: red in acid, red purple in neutral, blue in alkaline. It has excellent stability, high ... used in food, pharmaceutical, cosmetic and other industries. Gromwell Root P.E