The Lawsone dye molecules actually color the hair and skin by safely binding to their protein molecules. They darken as they absorb deeper into the hair and skin (bind to additional proteins). The color maxes out in about 48 hours and can naturally last for weeks.

How does lawsone reaction with keratin?

Lawsone reacts chemically with the protein keratin in skin and hair via Michael addition, resulting in a strong permanent stain that lasts until the skin or hair is shed. ... Lawsone isolation from Lawsonia Inermis can be difficult due to its easily biodegradeable nature.

How does henna work on the hair?

How henna works? ... When the henna leaves paste is applied to the hair, its active dye molecule, Lawsone, gradually migrates into the outer layer of the hair binding to hair protein creating a fast stain. The Lawsone essentially sticks to the hair without having to open the cuticle and washes off after a few washings.