Dark collagen hair dye, from Nitro Canada, brown

Effective formulation: Contains a very small percentage of ammonia enhanced with collagen that penetrates the hair layers during the coloring process, to treat damaged hair from the inside out. The collagen serum works to nourish the hair and make it softer. How to use: Color pulling system: Mix a quantity of hair bleaching cream in a non-metallic bowl with double the amount of oxidizing cream with collagen serum, then mix well. Divide the hair into four sections, apply the product to the hair, and keep it 1 cm away from the roots at all times. Leave the product on the hair for 30 to 40 minutes (depending on the desired bleaching level), then rinse thoroughly with water.