The Oligo Blacklight 18 in 1 Blue Hair Beautifier is the perfect summer spray to benefit your flawless blonde! It prepares, protects, and beautifies the hair while offering 18 essential benefits, PLUS it tones unwanted brassiness so you can enjoy endless sunshine and keep your blonde shining! This lightweight mist neutralizes unwanted tonalities (yellow) on levels 9 and 10. Can be used on the go between uses of the Blue Shampoo and Conditioner. It is a great product to bring on vacation where exposure to the sun can cause unwanted tonalities.