How long does the colour last and can I reapply regularly?

Because herbal colour coats the hair surface rather than bonding inside the cortex, it washes out slowly with each shampoo. Most people see noticeable colour for 4–8 weeks, though the exact duration depends on hair porosity, washing frequency, and exposure to sun or chlorine. There is no sharp demarcation line as roots grow out, which makes touch‑ups less obvious than with oxidative dye. You can safely reapply to roots or the full length every 2–3 weeks if you want to maintain vibrancy or cover new growth. Repeated applications build up the coating, which can increase shine and thickness but may also make hair feel heavier or slightly drier over time. If buildup becomes an issue, a clarifying shampoo once a month helps reset the base. Avoid mixing this henna with chemical dyes or perms in the same session; wait at least two weeks between herbal and oxidative treatments to prevent unexpected reactions.