OK, I have read this forum quite heavily and it's probably me but..... how can I make homemade nitric acid?!?!?! I know I need sulfuric acid and sodium nitrate but I am having trouble with finding SN. Do I just buy high level nitrogen fertilizer and sift it or is there a product I can use? What about urea, can this be used in place of SN? I thing I read there is too much ammonia in urea. thnx Baja