I can't make an invisible trackable

i have a model and texture that should be invisible but instead it shows as a light blue, any solutions?

u got team color wrong.. in the .mdl file, you need to change
Replaceable Id 1; or something like that to
Replaceable Id 0;
i think, theres plenty of tutorials on it. dont take my word for it.

hmmm, well i didn't make the mdl so maybe, thx

To make an invisible square trackable use one of these models.
I made them myself, the trick is to make a 100% black texture and make the material additive.

oh thanks KattaNa but twister was dead on, i found a tut, added 1 line to the .mdl and its all fixed now, thx