I love the girls that work in my local Sally’s (trade and non trade store)but honestly 99% of them know nothing about hairdressing , I’ve heard them giving the complete wrong advise before to someone who also isn’t a hairdresser, they’ve then remembered I’m shopping in store and asked the customer to ask me... to which I tell them to “go to their stylist for any colour as believe me they won’t be happy when they see you’ve burnt your hair” but to answer your question yes permenant colour will fade , like all colour but the permanent colour damage will be there unlike if a semi was used