I dried the liquid in a bottle cap, placed in a sealed container with anhydrous magnesium sulfate as a drying agent. Here is what I scraped off into a bowl:
Incidentally, within a few minutes of being in the dish the crystals had already absorbed enough water from the air to all become stuck to the dish. Even though the humidity in the room is under 40%.
I touched one of these crystals with a wet finger and licked my finger - it tasted more sour than bitter (did not swallow).
elphologist