Usually if you use boiling water you get instant dye release, but you also get faster demise of the dye release and the color may not last, actually fade a bit. I use hot black tea at the temperature that it is hot, but not uncomfortable, kinda like really warm bath temp. I wait till I just start getting dye release, then I put it in a ziplock, squish it flat and freeze. The color I am getting is almost twice as intense as nonfrozen henna.
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