The specially developed Igora Royal Oil Developer blends perfectly with products from the Igora series and is very efficient. Thanks to this, it lasts a long time and guarantees a perfect application, long-lasting colour results and excellent shine. The available four strengths depending on the desired effect - 3%, 6%, 9%, 12% - guarantee perfect results. Use: 3% 10 vol. For colouring darker and covering 100% grey hair or colouring with Igora Royal Creative pastel shades. 6% 20 vol. For tone-on-tone colouring, covering grey hair and lifting 1-2 levels. Note: grey hair cover with Igora Absolutes on more than 90% grey hair. 9% 30 Vol. For lifting 2-3 levels, colouring with -00 shades and grey hair coverage with Igora Absolutes; lift up to 3 levels with the Ultra Blonde Series (10-) 12% 40 Vol. Igora Fashion Lights Lift 3-4 Levels with the Ultra Blonde Series (10-), Lifting 4-5 Levels with the Special High Lift Series