Item Description: Achieve radiant colours, sparkling shine and lock the results in with Schwarzkopf Igora Royal Oil Developer. With an increased oil content, Igora Royal Oil Developer boosts the penetration of colour pigments to provide some seriously intense colour results. It comes in 4 strengths: 3% (10 vol), 6% (20 vol), 9% (30 vol) and 12% (40 vol). Use them as follows: 3% for darker or pastel colouring and for covering 100% white hair ; 6% for tone-on-tone colouring, white hair coverage and lightening 1–2 levels; 9% for lifting 2–3 levels (3–4 levels with the Special Blondes), colouring with -00 shades and white hair coverage with the Absolutes ; 12% for lifting up to 5 levels and for colouring with the Fashion Lights. This is designed for professional use only, wear suitable gloves and keep out of reach of children.