Another possibility would be that drinking from same kind of potion if already under the effect of it would cancel it. Not so interesting but then there'd be no case of wasting a good potion to cure bad one when it isn't worth it or any other possible problems.
Speaking of drinking same potions you could make bubbles stack with max of 3 or 2 at a time.
sorry'bout that. Any way to give a potion; you need to knock him out, go over to him and press attack while holding a potion, a little complex - but kind of logical.
Isn't attack supposed to throw it? What if you miss him or he wakes up before you use it I probably wouldn't want to throw it then. Purchase button might work a little better(I have no idea why it still doesn't have any use outside of shops)
I really like the case of a good potion going to waste in order to cure a bad one, it sets up a choice, and let the player make smart decision; like the player find a green potion and he happens to know that it is a confusion potion, he could then choice to take it in hope of finding a black potion which it cures, or finding an unknown potion choosing not to break it and not testing it (on a stunable enemy) because what ever the next potion is, he will be able to drink one potion without much fear (he will still lose 1 life to poison).
So when a player finds a potion he can choose:
drinking it! getting what ever the effect is. this is good because he gets the knowledge of the potions effect, he don't need to carry it, and there is good chance of a nice effect. It's bad because it might be a bad effect.
testing it! He only gets the knowledge of the potion, but he don't need to carry the potion for long, properly he knows of a caveman near by (very good because the surroundings effects his choices, makes for deferent choices), the bad he loses the effect, but it might be bad.
Use it as a cure! Good because he gets the effect, and only if the effect is bad does he lose another potion. here there is also some nice probability involved; if he takes a bad potion in hope of finding the potion color it cures, he only have 1/3 chance of that happening, if he takes a potion he don't know; he have 2/3 chance of using it as a cure... if he finds the same color potion he need to make a new choice: should he leave a maybe very good potion behind?
If you make bad potions only be cured by good potions, you leave the player in the dark, and many of the above chooses becomes less attractive.
stacking Bubbles removes choice, if he finds a potion knowing it as a bubble potion, should he carry it and wait for his current bubble to burst, or leave it keeping his current Item (what Item he has plays in to his choice (this is good)). If he can just drink it, there is no choice and the bubble potion don't need being better (IMO)
Purchase button I might use later to handle potions, but it sorts of the weird button people need to know to use it.
I think the bottom line is: I made my mind, and I really like the color bases dispelling

0.5.2 you mean?
yeah...

Version 0.5.2 (envies his younger sibling

)
slight fix to bubble potion
decreasing the negative effects of confusion