... Medicine 5.100ml*3 100% Natural Black Hair Dye---Allergy FreeIngredientPolygonum multiflorum extract, Vitamin B5, VC, ... use.2. It is a semi-permanent hair dye, whose effect could last about 1 month, ... Wash scalp, hair grease repeatedly to ensure the dye effect, dry the hair to 70-80%, then smudge the ... contamination of scalp, wear the bath cap to maintain temperature for 10 minutes(the temperature is ...