GLSL ideas/help

[RIL]

Hi all ! if anyone can point how to solve this. I need to change something about this shader. It works fine but when I insert it as a Tex Map in the 3d particles it does like a very fast and sutil "black out" when the color changes. And because of that the particles dissapear for a second. I cant find in the code that behavior. 

Thanks in advance

Maxi

GLSL.zip