Ammonia-free hair color, which uses other chemical and natural ingredients instead of ammonia. These dyes are less damaging to the hair and do not cause loss of moisture and protein in the hair follicles. They are also not harmful to the hair or skin and are the best option for those who want to dye their hair without any worries. If you have recently keratin-treated your hair and want to try a new color, you should use ammonia-free hair color for keratin-treated hair. Usually, vegan and plant-based dyes are suitable for keratin-treated hair and do not cause any damage. Since sulfate causes keratin removal from the hair, sulfate-free and ammonia-free hair color is a better choice for keratin-treated hair.