Since the Instant Nannichuan didn't turn Ranma into a hermaphrodite, or
Genma into a man-panda, I think it can be safely assumed that Nannichuan
itself is not a cumulative, but rather an overriding curse- that is, it
eliminates all other Jyusenkyo curses in favor of itself... and since
neither Ranma or Genma turned into anyone else, I'll argue that
Nannichuan only changes its victims into male versions of themselves,
which would make it an effective cure for any male curse victims.

Ah, but was the Instant Nanniichuan made from REAL Nanniichuan water, or
was it truly the magical junk that Cologne said it was? The jury's still
out on that one.
The only one to get a multiple dose of Jyusenkyo water was PTarou. We can
atribute it to the already multiple nature of his curse (which means that
he'll never get cured, 'cause Nanniichuan water would turn him into a
man-thing, not that he wants to be cured), or the springs are by their very
nature culmative (same result, except that NO ONE can be cured).

     OK. There are two things to remember. Takahashi said that
Nanniichuan would cure Ranma (so, if you're in standard Ranmaverse, QUIT
SAYING NANNIICHUAN WON'T CURE RANMA!!!!). Also, PTarou never got hit
with Nanniichuan.
     So, this said, we can also come up with the possibility the curses
are cumulative with the exception of SOD-"normal form". i.e. Nanniichuan
for Ranma, Mousse, Ryouga, Genma, and PTarou and Nyanniichuan for Shampoo
would cure the people. Other springs, unless total immersion was achieved
would have cumulative effects. If there was total immersion, then I think
the old curse would be supplanted by the new one.

Yep. Even in a pregenerated world like R1/2, you can twist and warp and
FUBAR the world to make it into your heart's (or hearts' ;) desire.

     Just make sure you don't claim it to be an extention or offshoot
to the original storyline.
--
Ben Kosse bmk7411@cs.rit.edu
BGC Otaku and worshipper of the Red-Eyed Goddess. Member of ShAS.
Anime, RPG's, computers, poetry (read/write), music (listen/compose).
Author of the Bubblegum Crisis theme pack (see the homepage below).
Homepage with anime and other interests. (http://www.rit.edu/~bmk7411)