A chemical dye lifts the hair's own pigment and replaces it. Henna does neither: lawsone, the leaf's orange-red molecule, binds to the keratin on the outside of the strand and adds its tone to whatever colour is already there. Grey hair takes it as a copper-orange; dark hair shows it as a warm, reddish sheen in the light.
That is why a strand test matters. Mix a little paste, apply it to a few hidden strands, leave it for the time you plan to use and look at the result in daylight. The shade you see is the shade the pouch will give.
01 INGREDIENT
Natural henna
Nothing else named on the pouch
100 G
Resealable pouch
Mix only what one sitting needs
LAWSONE
The pigment that does the colouring
Binds to the outside of the strand
STRAND TEST
Before the first full application
Henna shows differently on every hair colour