My friend has recently being diong push pulls, using 3:3:1 ratio. Thats with lab grade rp, Iodine and OTC phsuedo with success. Unfortunatly all the lab grade rp has dried up which meant seeking alternative means of rp. He gathered up a shit load of match boxes, cut the striking pads off, soaked them in acetone, decanted off acetone, washed with sulphuric acid, washed with HCL, washed with acetone, washed with distilled water, prefired with iodine and peroxide, used dh2o to free up rp, washed with acetone and then more dh2o. The push pull was then attempted just as before with nothing to show for it but a white minty tasting powder that near choked me when smoking it. Could it be the brand of matchboxs used? My friend used red heads.