L'Oreal Professionnel organizes shades as level.reflect:
- Level (1-10): Color depth. 1 = black, 10 = lightest blonde.
- Primary reflect: First digit after the dot. .0 = natural, .1 = ash, .2 = iridescent, .3 = gold, .4 = copper, .5 = mahogany, .6 = red.
- Secondary reflect: Second digit (optional). .43 = copper gold, .11 = deep ash.
Majirel is the flagship permanent line: full gray coverage, lift and deposit. Dia Light is acidic demi-permanent (low pH): ideal for toning, refreshing, and adding shine. Dia Richesse is alkaline demi-permanent: more coverage than Dia Light, without lifting.