Just updating with some results. The yellow had faded quite a bit by the end of the week, still visible, but not nearly as bright. We ended up using herbco's "blonde henna" (4 tbs) amla powder (1 tbs) 1 tbs lemon juice and enough strong catnip/chamomile tea to make a smooth mix. I let the mix sit out for 12 hours, and then applied to the hair and let it sit 3 hours before washing out. Interestingly enough, although there were no signs at all of dye release when doing a palm test, it does seem to have done something to Mom's hair. It still doesn't cover the grey as much would like, but the color is much better:
http://forums.longhaircommunity.com/...6&d=1422058610
We're going to try it one more time, then if it still doesn't look covered enough to her she'll probably get a box dye, but it was fun experimenting with it!
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