I retrieved my last element: air fairly easy. I was still examining the levers for the air tubes when suddenly I had the correct amount of each colour. Yay!
Now I'm in the Grey Mountain Asylum and have reached the top floor lab. This is one gory game!
Spoiler:I was so disgusted when that head started talking. I can't say I felt good beheading the corpse either. *shudders*
Colpet, I understand better now what you meant by seeing different layers of the story and that the four alchemists weren't very nice. This doctor was a creepy guy for sure taking advantage of young, defenseless girls.
The puzzles in this part of the game are a true delight though. Not too difficult, but still a challenge.