The 1-2-3 System indicates the degree of permanence of the hair coloration.  The following levels stand for:

Level 1 for color that washes out
Level 2 for color that lasts up to 24 shampoos
Level 3 for permanent color

Schwarzkopf & Henkel has tailored the 1-2-3 System specifically for your needs – because there is a wide variety of hair color products on the market, one can easily become confused.  Simply orient yourself using the three levels – they are easy to read on the package, making it simple to choose the product that is right for you!

(Curious about what lies behind the varying degrees of permanence in hair color products?  Then read more under Permanence and Effects of Coloration.)