The Color Brightening Hair Mask by Luseta has proven to be amazing, according to Kelsey's video review. She raves about its ability to eliminate yellow tones in blonde hair, leaving it looking vibrant and refreshed. The mask is a rich purple color and should be applied after shampooing, left on for 10 minutes in the shower, and then rinsed out. Kelsey mentions that brushing it through the hair after washing enhances the results. The mask effectively evens out the hair color, bringing back that desired blonde shade. Overall, Kelsey is pleased with the product's performance, as it successfully removes yellow tones and revitalizes her hair.