Well I've found this recipe to extract Potassium Nitrate from nitrate bearing potting soil containing 0.09% nitrate nitrogen and ive also found this one soil (well its more like rocky gravel) for turfs that contains 9.00% nitrogen nitrate. Okay so my question is can i extract the one with 9.00% when its in gravel type form with boiling water and ash on the bottom of it like the recipe says or should i just stick with the potting soil. Also i saw that the 9.00% percent one is from ammonium nitrate. Oh yeah the recipe is from jolly roger i know its not safe but what the heck its not nitroglycerin. I've also been looking for sulfur. I was wondering if it was possible to extract it from epsom salt (magnesium sulfate) but i was thinking that was pretty hard and i should stick to going to nurserys or pharmacies (despite the fact that at pharmacies you have to have a damn good explanation to tell them why you need it) and well yeah. i was wondering if i could get sulfur (90% pure or more in crystalline/powder form) from household ingredients using a safe procedure...well...dont worry abou thte safety too much... :) Thansk i would really appreciate the help im just trying to experiment with a little bit of gunpowder in pyrotechnics.