Khadi herbal hair colour senna cassia neutral cassia can be used with amla or shikakai on dyed blond hair leave on for only 15 minutes khadi amla henna indigo ampamp cassia can be mixed to create individual hair colours results from khadi natural hair colours depend on hair type existing hair colour duration ampamp warmth always do a strand test to establish colour desired before application 100g dyes shoulder length hair long lasting colour voluma