You're welcome.
For all practical purposes, one may get reasonably clean product by the procedure listed in section 2, to line 36. The chemical treatment involving silver chloride calls for hydrogen sulfide, which is immensely toxic and foul-smelling (at concentrations where others in the area can smell it, you'd already be dead). This is not advisable without a fume-hood and carbon trap.
"Nothing is true, everything is permitted." ~ hassan i sabbah
"Experiments are the only means of attaining knowledge at our disposal. The rest is poetry, imagination." -Max Planck