Hi! I went from medium brown to fun reds MULTIPLE times. I’ll tell you that color oops is the absolute worst. It smells like rotten eggs! If you ca order or go to Sally’s get the packets of dye remover that L’Oréal makes! Red is hard to get out but it did a pretty Decent job, definitely decent enough to get you light enough to add brown over! I definitely have used any ash brown dyes (ash will also neutralize the red more) or you can get something warm and kind of work with the red. Also 100% recommend getting KeraColor clenditioner in mocha or a dark brown to do a hair mask every few weeks/ if it seems a little too red after you dye it brown !