[stuka_40]

They are RGB(Red Blue Green) and alpha channel (transparency) values,in your example it means:
0.25 X 255=64 Red
0.55 x 255=140 Green
0.23 x 255=59 Blue
and 0.23 x 1.0=0.23 alpha channel

Code:

Color0 0.4 0.4 0.4 0.8  
  Color1 1.0 0.50 0.14 0.0

* In a effects file the Color0 is the primary color of paricles and color1 is the final color of particles.
Maybe time to go and play with effect files color now! :wink: