Be patient, fading vivid color takes time.
Semi-permanent hair dyes like Medusa Hair Dye are made to fade gradually with each wash. They don't penetrate the hair shaft as deeply as permanent dye, but vivid pigments—especially pinks, purples, and reds—can cling to the hair cuticle longer than expected. Trying to rush the process with harsh methods can result in dry, brittle hair or even uneven results.