this is 24 hours after henna removal. this was from natural henna paste made in my kitchen. in 24 more hours,the henna will be near black. there is never ever a reason to use chemical fake henna to get a dark stain. if your artist is using ready-cones, fire them. you deserve only safe henna. and just so that you understand, even if you never ever had a bad reaction to ready-cones or chemical store bought paste, you could suddenly have a reaction today. ppd causes cancer;.