Prevent premature greying of hair

Take one cup of aamla (dry) and two cups of curd. Keep the mixture in an iron vessel overnight, mash and apply on your scalp. Your hair will gradually get its colour back.
Boil one cup of dried gooseberries with four cups of water. Add a pinch of sugar in it. Keep boiling till the quantity of the liquid reduces to one cup. Mix two cups of henna, an egg, juice of a lemon and the gooseberry solution and apply it on your hair.Wash hair after two hours.
Take a little henna, an egg, juice of half a lemon, one tablespoon of instant coffee powder. Mix these ingredients together and apply on your hair. Wash after 45 minutes.