Behind Door Number Three ...

You pick one of the doors in a long hallway of doors and find an expansive laboratory. There are several options:

Grab the nearest box

Take the Lockbox and Run

Not really wanting to stick around in an unsafe location, you decide the best strategy is to smash and grab. So you smash the nearest box you can find, grab the contents, and run off to a more sheltered area to investigate. When you open your hand, you're more than a little disappointed with what you find.

You got an item: black flakes

Investigate the shelves on the right

Trusty, Dusty, Not-so-portable Laboratory

The shelves on the right turn out to be almost universally boring. Dusty boxes filled with scraps of paper, cheap glass test tubes, mostly neglected chemical equipment, and lots of dust. I did mention all the dust, right? Houses get dusty, but castles get dusty.

Eventually you give up in dusty disgust. On your way out you notice that you've gotten some green stuff all over your clothes. You brush it all up into a little pile, and it turns out it's a sizeable amount of whatever it was.

You got an item: green residue