Ah, no my apologies I misread the expectation. I can get you close to what you want though. This material uses Particle Relative Time which always each particle to have a slight offset run through the color gradient (Red Texture is a color gradient from red to Violet). You could dig into the code to see the per particle call which would allow you to set your color call as you want. We do have a report of the GPU Initial Color Behavior in to our engineers.
Thank You
Eric Ketchum
