Joico Colour Infuse Red is a color-depositing conditioner formulated to refresh red tones between salon color services, for both natural redheads and hair that's been colored red. It's used as the second step after Colour Infuse Red Shampoo, and works by depositing red pigment onto the hair fiber with each wash rather than simply cleansing or moisturizing.
The formula is paraben-free and includes conditioning agents alongside its red-toning pigments, so it helps counter the dulling and fading that red hair color is especially prone to. It's not a substitute for permanent color — the pigment sits on the hair surface and will still fade over time — but it extends the life of a red color service and keeps tone consistent from wash to wash.