I've been wanting to play with natural colorants. Last year I purchased some beet root powder. I know the colors will bleed unlike oxides, but will beet root or tamarind stain the skin if used in CP?
I can't give a conclusive answer about staining, but I have read that beet root powder turns yellow in CP soap, so I'd guess it won't. I'd also think it would be more likely to stain washcloths than skin.
Post pics when you're done -- I like natural colorants too but have never used either of those two.
ETA: Looks like Obsidian beat me to the punch -- great minds think alike!