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The difference? Printed From: HairBoutique.com Category: Hair Talk Forum Name: Hair Color Forum Description: The tricks and tribulations of changing your hair color URL: https://talk.hairboutique.com/forum_posts.asp?TID=42948 Printed Date: October 05 2025 at 10:29pm Topic: The difference? Posted By: green_kitten Subject: The difference? Date Posted: May 02 2006 at 10:50pm What is the difference between "demi-permanent" and "semi-permanent"?  Also, I've heard that you can't put permanent dye over hair that has been dyed with henna dyes, but why is this?  Thanks, just curious. Replies: Posted By: meli Date Posted: May 03 2006 at 3:07am demi-permanent lasts longer than semi.  As far as henna, I'm not sure exactly why, but I'm sure it has something to do with the way the henna attaches to the hair...you can always google-it though :) Posted By: green_kitten Date Posted: May 03 2006 at 1:30pm Ohh... thanks.  I was thinking maybe people were mistyping "semi" as "demi" but then I saw some "demi-permanent" color at Sallys lol, thanks for clearing that up.

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