HAIR COLOR 101: BEGIN WITH A CONSULTATIONLOOK & LEARN What you need to know to color and style like a pro.
If she's looking to dramatically change her hair color (up to 4 Levels darker or lighter) or wants 100% gray coverage, choose a permanent formula. On the other hand, if she wants to refresh, enhance or darken her current color, or is looking for about 50% gray coverage, a demi-permanent formula will give her beautiful results with less commitment.
Once you've chosen either permanent or demi-permanent color, you need to decide whether you want to work with a liquid or crème formula. Many colorists prefer liquids for their speed of application, while others like the greater application control of a crème.