I henna'd back in December over Manic Panic and Special Effects. I had a streak of green and a streak of purple, along with chemically dyed rest of my hair. It turned out really well, and you could still see some purple/green when I was in the sun (which I liked).
Since your hair is red already, henna will look great and vibrant.
Good luck and post pictures!
Lady Enyo of the Brave Victory in the Order of the Longhaired Knights
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