Garnier Men Shade 1 Shampoo Color is not a permanent hair colour. It is a semi-permanent type of hair dye that is designed to give a natural-looking colour for a limited period. As mentioned on the pack, the colour usually lasts for about 5 weeks, depending on your hair type, how often you wash your hair, and the shampoo you use. Unlike permanent hair dyes, this product does not deeply change the natural structure of the hair. Instead, it coats the outer layer of the hair shaft. Over time, the colour gradually fades with regular washing and normal hair growth. It is a convenient option for men who want to cover grey hair quickly without committing to a long-term change. However, because it is not permanent, you may need to reapply it regularly to maintain the desired shade and a consistent appearance.