... 100% Natural Black Hair Dye---Allergy FreeIngredientPolygonum multiflorum extract, Vitamin B5, VC, VE, food additive, EDTA2Na, amid acid, Chinese medicine natural pigment ... long time use.2. It is a semi-permanent hair dye, whose effect could last about 1 month, colored solid, ... allergyUsing method1.Wash scalp, hair grease repeatedly to ensure the dye effect, dry the hair to 70-80%, then smudge the ...