I had an old scrap gold ring that I wanted to recover the gold from, and it would have been nice to mix up some aqua regia and dissolve the thing, and subsequently precipitate the gold with SO2, oxalic acid, ferrous ion, or alkaline peroxide.
but once a few years ago I did that with a small amount and it turned out that the tiny amount of HCL vapors escaped into the garage, only a tiny amount, not enough to dissolve any tools or anything, but, that tiny amount did catalyze or activate all the iron in the area, including my tools, clamps I use for woodworking, etc.
So alater time when I wanted to recover the gold, I mixed up a salt solution and just made the ring anodic. It worked. Plus, during the course of the electrolysis I hit on the exact conditions necessary to cause the gold to plate out on the glass. It was beautiful. This is normally difficult to do, and requires formaldehyde, a reducing sugar, and careful control of conditions, etc. So, by not going the easy aqua regia route, I ended up discovering a way to produce coherent layers of metals on glass without the use of traditional materials required to do so. This came in handy when wanting to make glass conductive for a Graetzel-style photovoltaic cell.
I think people who desire to play with explosives should re-think their desires, as there are many other better and more productive ways to spend one's time. I think its the responsibility of all responsible chemists to never post anything openly that could be used by others to do something unlawful, as it could be construed as aiding and abeting, in addition to just not being right. Anyone who has a legitimate use for nitric acid or any other chemical should have no problem in their procurement, its only those having bad motives who need to worry and be secretive. Desiring to be secretive can be a tip-off of bad intents.