Eric.... I wouln`t wait more than a few days... in fact if you have time I`d simply swing by to ask Didi to cast an eye over it....she`ll know instantly if there are any issues and can advise you.... she will most likely be able to `tweak`any colour-matching issues for you ....you can make the appointment with her for your cut-in and in the meantime, take it home and `treat`it as suggested [wash,brush, misting etc] There`s no need to wait weeks at all....I usually just wait a few days / a week max. before getting it cut-in. You`re going to a very experienced stylist so give her a bell and chat to her about it.... I`m sure she`ll tell you to pop on over with it .... that will be worth far more to you than us `speculating`on here when we can`t actually see it.... why not post us a few pics by the way? I`m just trying to visualise this colour-difference thing .....