Cosmetics Formulation Development

If we want to make shampoo and conditioner for เปลี่ยนสีผม I don't know if I can. or not And if I dye my black hair, will it be colored? Please answer me. Thank you.

Hello, let's look at a sample recipe from SemiColor - Red Brown

Thank you very much Let me ask you another question. When I saw the black malva shampoo that wash and make my hair black, I don't know if the color from the flowers can stick to the hair for a long time and is as good as the semi color or not.

Hello, please inform the ingredient list on the product label. for the team to check