Josh Wood Colour 4.0 Darkest Brown Permanent Hair Dye. Achieve salon-quality results at home with this permanent hair dye. The 4.0 Darkest Brown shade offers a rich, deep color. This ammonia-free formula ensures a comfortable coloring experience while providing 100% grey coverage. Infused with nourishing ingredients, it leaves hair feeling hydrated and looking super shiny. Perfect for adults seeking a long-lasting, vibrant hair color.