I've had stubborn blue and purple on the ends of my hair for what feels like two years now and I finally got it light-ish enough to dump Vampire Red over it. I love my blues and purples but I've never been so happy to be fully on the warm end of the spectrum. The red covered pretty well making a burgundy wine color in the darker spots. Inspiration was a hibiscus flower.
Recently refreshed rainbow + length update. I think the ends of my hair are permanently stained purple/blue... I'm trying to make the other colors crawl further down the strands and hoping maybe they can overpower the stain eventually.