Shoot, forgot to address your second question. I had platinum blonde hair (bleached) that I dyed to get close to my natural color and then I did henna over it. It looks a little different than my natural colored roots but only if you know what you are looking for...and this is more because of the bleach and not the hair color. However I am not a henna guru as my first henna was just a week ago but I did a lot of research here and on henna for hair and found it didn't seem to be an issue doing henna over dyed hair. Here is a link to my pre and post henna head http://www.flickr.com/photos/linustootsie/7515859234/
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