Found it on you tube. Get some powdered vitamin c and mix it with head and shoulders. 1 part vitamin c to two parts anti- dandruff shampoo. If you cant get powdered vitamin c then crush some with a rolling pin in a plastic bag until its a fine powder. Add to hair. If its a bit thick add a tiny bit of water. Make sure you make enough to cover your head equally all over. Leave for anything from 30 mins to 2 hrs. I left mine on for about an hour and it was perfect. I wrapped it in a shower cap and then a towel and then washed it out and cleaned it with more anti dandruff and a applied a deep conditioner to it. It really works!!! I was so relieved. YOu can do it more than once but make sure you use a deep conditioner.just thought id share. My hair was black [ according to dd] and it turned it a nice chocolate brown.