Joico Vero K-Pak Color IntensityMermaid Blue Semi-Permanent Creme Color, 4 oz. is part of the best hair color products that offers vibrant colors. This clear mixer is used with the product line's semi-permanent colors, giving you the option of making colors more intense and giving you more control over the shade. Hair is reconstructed and repaired as it's being colored, resulting in shiny, healthy hair.