The two are similar, but not exactly alike. Permanent hair color is hair dye that will last a long time, without washing out; it needs to grow out. That's because permanent color opens the cuticle ...

Demi-permanent hair color is ammonia-free, slightly alters hair tone, and lasts between five to 12 washes. Unlike semi-permanent dye, demi-permanent color penetrates the first layer of hair, providing ...