The demi-permanent is what I usually use because it's a lot nicer to my hair and uses an activator (that smells nice) instead of peroxide. It can't lighten your hair, but if you're wanting a change in tone or to go darker, it's nice. It doesn't fade as much as a semi-permanent color, but more than a permanent one (but still not much unless you're doing red, those all fade). I've found that because of the fading, the demarcation line when the roots start showing is a lot less noticeable and I'm able to go longer between colors.
They also have a permanent line that is good as well. :)
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The demi-permanent is what I usually use because it's a lot nicer to my hair and uses an activator (that smells nice) instead of peroxide. It can't lighten your hair, but if you're wanting a change in tone or to go darker, it's nice. It doesn't fade as much as a semi-permanent color, but more than a permanent one (but still not much unless you're doing red, those all fade). I've found that because of the fading, the demarcation line when the roots start showing is a lot less noticeable and I'm able to go longer between colors.
They also have a permanent line that is good as well. :)