Hypergolic Ignition of Various Compounds with Nitric Acid shows the ignition of powdered solid borane compounds with a drop of concentrated nitric acid. Reaction is completed within 10 ms of contact. The green color indicates the presence of boron.
See the original movie in glorious slow motion.
Credit: Stephen Heister, Timothee Pourpoint, Steven Son, Mark Pfeil, Jacob Dennis, and P. V. Ramachandran of Purdue University, via the Central States Section of the Combustion Institute
"Vantage", LEGO Game Boy Advance Transformer by Baron von Brunk. Check out the tutorial on Instructables to build your own!
At last, the next LEGOformer in my most popular series — Vantage, a powerful robot that transforms into a Nintendo Game Boy Advance, armed with battery blasters and parody “Boom” automatic shotgun! With a basic design much akin to my Game Boy robot Domaster, along with a refined transformation cycle similar to that of my Game Gear robot Gearhead, this new figure is very sturdy and well-articulated. My previous LEGOformers were built “organically”, as in I’d compile a ton of relevant pieces and build the robot via trial and error — whilst this particular one was my first to be almost entirely designed on the computer with LEGO Digital Designer before being physically built and tested. That being said, the 3D instructional guide was released simultaneously. What was the most challenging part? That Boom shotgun: I spent several days trying to make one that looks like an actual gun as well as having the ability to be held by the robot as a weapon. I chose Doom since that was my favorite GBA I played in high school back in 2002. My second favorite GBA game was Namco Museum!
-Baron von Brunk