What does demi-permanent mean?
Demi-permanent hair coloring will stay in your hair longer (long, long time) than semi-permanent hair coloring if you have lighter colored hair. If you have dark colored hair, it will stay in for a few weeks before going back to normal hair color.
.. if your highlights are too orange or yellow you can put a demipermanent color slightly lighter than your natural to make a subtle highlighted look. Uneven layers are tricky because you may end up shorter than you want but you should ask your stylist to take off as little as possible to make your layers look even and texturize the ends, whick makes it blend better.
Technically, you can't wash out hair dye. There are four types of hair dye in all. Temporary color is used for a shot of bold color to make a statement and washes out in one shampoo. Semipermanent color is normally used for toning hair or adding a subtle affect to current color and fades gradually over 10 shampoos. Demipermanent color is used as a gray blender, natural color enhancer, a color refresher or a filler…