How To Use:Usage of shades with up to 100% white hair coverage:Use Igora Royal 3%, 6%, 9% or 12% Developer. Mixing ratio 1:1 Apply on dry hair.Allow to develop for 30 – 45 minutes.Rinse well.Use 3% Color & Care Developer when coloring darker. Use 6% Color & Care Developer for tone-on-tone, 1 tone lighter or coverage.Use 9% Color & Care Developer for coloring 1-2 tones lighter.Use 12% Color & Care Developer for coloring 2-3 tones lighter. (1) count of M Hair Designs Tint Brush. 2 inches wide.4 inches long.Black color. FOR PROFESSIONAL USE ONLY.