Paintglow rebellious semi permanent thick conditioning hair dye is easy to use hassle free develops in 15 30 minutes free of ammonia or peroxide ready to use formula conditions the hair and is available in 12 unique colour shadeswe strongly advise you read the instructions before use and perform a patch testto achieve the best results it is recommended that you apply to pre lightened or bleached hair semi permanent hair dye will last for 4 8 washes this can vary dependant on hair types