What result can I realistically expect on my current hair colour — whether it's light, dark, previously dyed, or grey?

Light or previously lightened hair (level 8–10): The henna base deposits a strong, fiery copper-red that reads almost like a semi-permanent fashion colour. Because the cuticle is more open, uptake is high and the shade lasts 4–6 weeks before noticeable fading. Medium blonde to light brown (level 6–7): You'll see a clear copper glow in daylight and under warm indoor lighting; indoors it may read as a rich auburn sheen rather than a true red. Dark brown to black (level 1–4): The pigment cannot lift your natural melanin, so the effect is a subtle warm reflex — think copper highlights that catch the sun — rather than an all-over colour change. Grey / white hair: Henna binds well to unpigmented strands, but because grey hair can be more resistant, the first application often yields a bright copper-orange that softens to a more natural copper after 2–3 uses spaced a week apart. Previously dyed hair: If you have permanent oxidative colour, the henna will coat the outside of the shaft; the result depends on how porous that old colour has made your hair. Always strand-test a hidden section (nape or behind the ear) first — process for the full time, rinse, dry, and wait 24 hours before committing to a full head.