What do keratin, vitamin E, and linseed oil actually do in this formula? — TINT SEMI-PERMANENT EFFECT COLOR Bad Girl NEON GREEN 150ML

Because direct dyes deposit on the outside of the hair, the condition of the cuticle directly affects how evenly the colour lays down and how the hair feels afterward. Hydrolysed keratin fills microscopic gaps in the cuticle, creating a smoother surface so pigment distributes more uniformly and the hair feels less rough after rinsing. Vitamin E (tocopherol) acts as an antioxidant in the formula itself, helping stabilise the pigment and prevent premature oxidation in the bottle; on hair it contributes a conditioned, softer feel. Linseed (flaxseed) oil is rich in omega-3 fatty acids and forms a light, flexible film that seals in moisture and adds gloss without heaviness — useful because vivid direct dyes are often used on bleached hair that tends to be dry. Together, these ingredients mean you are not just depositing colour; you are also giving the hair a conditioning treatment in the same step. They do not replace a dedicated mask or leave-in for ongoing care, but they reduce the typical post-colour straw-like texture.