From dark brunette to bleached-out platinum, then pastel pink and back to brown—Kim Kardashian West tried literally every haircolor trend this year. That’s why we talked with her colorist to snag (and share!) the formulas and techniques used to restore her color-treated hair back to a healthy, natural-looking brunette.

Redken artist Cassondra Kaeding (@ckaedingcolor) worked alongside Kim’s go-to colorist and hair guru Chris Appleton (@chrisappleton1), and she’s dishing out everything about the newsworthy color process—check it all out below!

1. Let It Fade Out
Direct dyes like Kim’s pastel pink aren’t permanent, so…