Henna/Indigo hair dye: This two-step method using henna and indigo can work very well for covering grey. Dye your hair with plain henna as explained on the henna page. Doing the henna application first helps the indigo attach to the hair. In a different bowl, mix up the indigo powder with enough warm water to make a smooth paste. Let the mixture sit for 10-15 minutes but no longer. The green mixture will turn a purple/black on top. Apply it to freshly henna’ed dry hair, in the same manner you applied the henna paste. Wrap in clingwrap and a towel and leave it on for 45 minutes to 4 hours. Keeping your head as warm as possible will help the indigo to release the dye. Rinse thoroughly, shampoo and condition. Some people prefer not to shampoo straight after rinsing, but to wait for 24-48 hours to allow the indigo to oxidise. You can also just use a conditioner after the rinse, and not a shampoo. On some hair types this helps the dye to be more effective and you might need to experiment to find the best method for your hair.
You can try adding 1 teaspoon of salt per 100g of indigo to the mixture to help the indigo to ‘fix’ more effectively.
Indigo is not as stable a dye as henna, so you might find that you need to reapply just the indigo in between henna/indigo applications.
Please do a strand test to determine the application time. If you are aiming for dark brown/black hair you can probably leave it on for the maximum time. Sitting under a salon dryer for some of the application time will help considerably with the dye ‘taking’, and also shorten the application time.
Have fun experimenting!
Please note: for external use only.
Any leftover indigo mixture cannot be frozen. If you have unused dry indigo powder, reseal the packet and store it in a cool, dry place.