Dissolving glass in hydrofluoric acid - GIF

[nova_robotics]

Cody's Lab did a great video on this. He was trying to prove that it was impossible to bore a hole through tempered glass because the internal stresses were too high. So he figured instead of mechanically drilling through the glass, if he used acid to slowly eat through the glass over the timescale of weeks he could eliminate a source of error from the experiment. Very interesting stuff. Spoiler: the glass shattered.