How does this tinted shampoo differ from permanent hair dye?

Victoria Beauty Ruby Tinted Shampoo is a wash-in colour product, not a permanent oxidative dye. Permanent dyes use ammonia and peroxide to open the cuticle and deposit pigment deep inside the hair shaft, which permanently alters the natural melanin and requires root touch-ups as hair grows. This shampoo deposits ruby-toned pigments only onto the outer layer of the hair while you lather and leave it on for a short time. The result is a temporary tone refresh that fades gradually over several washes, making it a flexible option when you want to deepen your shade, add warmth, or soften the look of first grey strands without committing to a permanent colour change. Because it works on the surface, it cannot lighten hair or cover a high percentage of grey the way permanent dye can. It is applied like a regular shampoo, which many find easier to distribute evenly, especially on short to medium lengths. Always follow the enclosed leaflet for processing time and rinse thoroughly.