Here's what I'm thinking. If you're swimming under water and a running out of air, what does one need? Air. So I feel our magical breath potion should have some sort of 'air' in it to fill up the lungs.
My solution to get air in the vial was to trap some air underneath some liquid. (I thought this would be more interesting than just a vial of boring air.) The "air" in my concept is actually a magical gas or smoke of some sort. (My original idea was to have it look like a semi-transparent gas, but I soon learned I couldn't figure out how do draw it like that without considerably more effort.)
So, a magical gas (or smoke) is completely trapped underneath the liquid. (You can see how the trapped gas/smoke has a convex shape to it; it's being held down by the liquid.) When taken, the magic takes effect and the thief's lungs fill with air. Naturally.
It is hard to see from my static drawing, but I envision the potion to be full of motion. There are champagne-like bubbles going up the liquid (as someone previously desired for a different potion), and there's a tumultuos gas or smoke randomly churning about underneath it.
(I hope you can see this drawing on your monitor okay. I've learned that my professional series monitor richly recreates black colors and darkness much more vividly than other monitors I encounter. I can brighten this drawing up, if need be.)
What do you think?
Here's a slightly larger version:
Edited by Darkness_Falls, 08 May 2005 - 04:09 AM.