For black hair that has gone grey, use henna in combination with sesame (gingelly or til) oil and curry leaves. Boil some sesame oil, add a few curry leaves and keep this liquid in a tightly closed container. Any time you want to colour your hair, add some henna into this extract and boil for a few minutes. Cool and apply to hair, wait for three to four hours and then wash your hair using shikakai.If you are looking for a burgundy shade, cut and grind a beetroot and mix this juice into henna to make a paste.Henna alone gives a copper red colour and only indigo (neel) gives a blue colour; by combining henna with indigo in different proportions, you can get varying shades of brown. If you want a redder colour, keep henna levels high and if you like more brown, include more of indigo. Apart from colouring your hair, henna has other properties to make your hair strong and beautiful.