Absolutely the best hair colourant ever. Totally natural and you don’t need to use the whole bottle in one go so it lasts ages. No harsh chemicals so you can use as often as you like, I touch up my roots once a week. Totally covers grey and gives a shiny natural look, unlike the block colour of chemical products. Only downside is supply chain sometimes runs out as dark brown is popular so you have to wait to reorder. If the house were on fire, I would grab my Surya stash along with my passport.