I have a client coming to me tomorrow and was wanting abit of advice on what to do! For years she's been getting base 10 full head tint from another salon But she's pretty much 100% white at front but only 50% at the back so she is saying the colour at the front comes out great but is very warm underneath! She's wanting me to help get the same colour all over I wasn't sure whether or not to add an ish to just the back???!!! Help xx