Wait, I have the fealing you don't get me. (i think i explained confusing...)
I want to have a sword-trace wich is red but also black on ike's sword.
I know how to change this trace
http://i40.tinypic.com/5b44zn.png
but if you look, The image doesn't have any transparancy, right? Now, the problem is that sword traces 'replaces' transparancy with black. I want to have this kind of effect:

But since black = transparancy I can't do this right now.
Is it possible to use black (seeable in-game) with this kind of technique?