yeah it works, but it's a pain in the ass if you are trying to be accurate with it.
each one will turn out different from the last and after a few shirts the color will just begin to mix as another new color each time you redisplace the ink for the next pass unless your are very careful. works best if you have white laid down underneath first and you just do ONE swipe of the split overtop. of course then you get little bits of the white peaking through too though. like i said a pain in the ass unless you are willing to clean the screen a bunch of times during the run and re-ink the thing. this is all from my personal experimental experiences anyways. that was years ago. alot of them turned out looking more swirled or tye-dyed looking than just a split fountain too.