Here's my tests of cassia (top) and cassia + katam (bottom). The white roots are to the right of the scotch tape, and you can see the henndigoed lengths on the left of the tape. There is no "before" photo, but the roots were pure white prior to the application of the herbs. I mixed with tepid tap water and left the pastes on for approx. 8 hours.
The cassia by itself produced a very very light platinum blond. The cassia + katam seemed to produce basically the same color as katam by itself, a kind of patchy gray/green/blue. If you look at very tip of the roots you can see the colors better.
ETA: I left the pastes on overnight, and the colors did not seem any different than shown here.
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