What it is: Need heavy-duty grey coverage? Look no further than Redken Cover Fusion hair color! It's a permanent dye that gives outstanding grey coverage. Choose from coppers, browns, and golds to enhance your overall look. What it does: When used with a quality developer, this permanent hair dye penetrates the hair shaft to deposit hair color molecules deep within. It can cover up to 100% of greys in one application. The dye both colors and conditions the hair with argan oil, rice protein, and conditioning polymers.