Schwarzkopf

The system is based on a combination of up to 4 numbers. The number before the hyphen indicates the tone height on which to use the shade. The first number after the hyphen indicates the primary reflection - the second number after the hyphen indicates the secondary reflection - two identical numbers after the hyphen indicate the reinforced main reflection - the third number after the hyphen indicates a minor reflection. How to Use Mixing ratio 1:1 for normal colours. Mixing ratio 1:2 for super-lightening special colours. Application for natural hair: apply first to the mid-lengths and ends. After 10-15 minutes apply to the roots. For regrowth: apply first to the roots. After 15-30 minutes use the Dual-System technique on the mid-lengths and ends. Application time: less than or equal to 30 minutes 10 volumes (3%) 30-45 minutes 20 volumes (6%) 30-45 minutes 30-volume (9%) 30-45 minutes 40-volume (12%)