One reason for doing is this getting alot of red goo during recrystallization that is insoluble in naphtha, though i have read that n-oxide is not red, but conversion would allow separation from whatever else composes this goo. This stuff does not crystallize, but remains a goo if dried. It may be smokable, but there is reason to suspect that much residual solvent would be trapped within it. Zinc was proposed by ron69 to turn it back into its freebase form, however if there are other oils in it, i would have reason to suspect it might hinder the reaction, but maybe ron69 cam chime in on that one and clear that up.
I suppose getting elemental zinc might be a good option, except that it gives away your position on the gestapo's radar, or maybe im just being paranoid, however i did take note of the "we reserve the right to ask questions and limit quantities" on alot of sites.
I am also foreseeing the issue of how much zinc to add (on a 1:1 ratio), for how is one to know the weight of the goo without incurring massive losses? Most scales that read on the gram level cant hold much weight or arent very accurate.