Self-tanner to colour hair?

Dihydroxyacetone (DHA) is a molecule derived from certain sugars present in self-tanners. When applied to the skin, it reacts with amino acids in the stratum corneum to form melanoidins, brown pigments that produce a temporary tint. DHA is used in some natural hair dyes, described as non-oxidising. These dyes coat the hair fibre with a surface colour without penetrating the cuticle or altering keratin. But is a self-tanner, with the same molecule, as effective on hair?

Using a self-tanning product to colour hair may seem appealing, but it is not designed for that purpose.

Several factors explain why self-tanner is not suitable for hair. First, self-tanners do not include ingredients that ensure lasting adhesion to the hair fibre. Indeed, the formulations of self-tanners are adapted to the skin but not to hair’s texture and characteristics. Hair requires specific ingredients, such as binding agents, pigments suited to its structure, and nutrients that support colour adhesion and durability. These ingredients are absent from self-tanning formulas, so applying them to hair may produce unwanted effects, such as yellow or orange tones, rather than the shade expected from a hair dye. The sticky texture of some self-tanners may leave a dull, uncomfortable finish on the hair, reducing its shine and natural appearance.

It is also important to protect your hair when applying a self-tanner to your skin. Here are some tips:

• Tie your hair into a bun or use a headband to prevent it from touching areas where you apply self-tanning product.

• If you apply a self-tanning product near your scalp, wear a shower cap to protect your hair.

• In case of accidental contact, remove self-tanning residues with lukewarm water to prevent hair discolouration or stickiness.