nethack spoiler site http://www.nethack.de/
Maintainer: Sascha Wostmann (sascha@nethack.de)
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From: richardg@cuug.ab.ca
Newsgroups: rec.games.roguelike.nethack
Subject: Fun with Chemistry
Date: 4 Jul 1996 12:21:59 -0600
Organization: Calgary UNIX Users' Group

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Well, here we are: someone asked for it, and I've got it.  I must admit, 
it was a learning experience for me too.  For one, it was the first time 
I went to the source to find out something, and for two, I've neer 
bothered before, but here are the effects of mixing potions.

Potion of Healing:
~~~~~~~~~~~~~~~~~~
+ Speed, Gain Level, or Gain Energy = Potion of Extra Healing

Potion of Extra Healing:
~~~~~~~~~~~~~~~~~~~~~~~~
+ Gain Level, or Gain Energy = Potion of Gain Ability

Potion of Gain Energy, or Gain Level:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ Potion of Confusion = 1/3 chance of Booze, Enlightenment otherwise
+ Potion of Gain Energy = Potion of Extra Healing
+ Potion of Extra Healing = Potion of Gain Ability
+ Potion of Fruit Juice = Potion of See Invisible
+ Potion of Booze = Potion of Hallucination

Potion of Fruit Juice:
~~~~~~~~~~~~~~~~~~~~~~
+ Potion of Sickness = Potion of Sickness
+ Potion of Speed = Potion of Booze
+ Potion of Gain Level or Gain Energy = Potion of See Invisible

Potion of Enlightenment:
~~~~~~~~~~~~~~~~~~~~~~~~
+ Potion of Levitation = 1/3 chance of Potion of Gain Level
+ Potion of Fruit Juice = Potion of Booze
+ Potion of Booze = Potion of Confusion

That's what I got from the sources.  In wizard mode, I found that there 
were many other things that could happen.  Mostly, I think it was just 
the random effects of not having a definite effect.  Things that can 
happen with mixing of other combinations:

"The potions mix... The mixture glows brightly, then evaporates."
Pretty easy to see what happens.  Both disappear.

"The potions mix... BOOM! They explode!"
Again, self-explanatory.  The mixture explodes, you get injured, potions 
disappear.

"The potions mix... The mixture fizzes, then clears."
A potion of water is made.

"The potions mix... The mixture looks [whatever sickness is]."
A potion of sickness is made.

Hope this helps,
Brian

-------------------------------------+-------------------------------------
  Brian Richardson, aka ShadowHawk   | "I think it's remotely plausible that
      richardg@cuug.ab.ca            |  someone might think you're hot."
http://www.cuug.ab.ca:8001/~richardg | -- Agent Mulder