Change color of Particles

Hi,

I am wondering why the below code is not changing the color of my particles:

public GameObject instRegularParticles ; public Color [] holder ; void OnParticleCollision (GameObject other) { Debug.Log("Particles Collided"); // happens

 holder = new Color[5];
 holder = instRegularParticles.GetComponent<ParticleAnimator>( ).colorAnimation;

// change the initial value of 255,255,255,255 to redish? holder[0].r = 155f; holder[0].g = 41f; holder[0].b = 48f; holder[0].a = 214f; // coppy?
instRegularParticles.GetComponent<ParticleAnimator>( ).colorAnimation = holder; }

This logic worked when I wanted to decrement (fade particles away), I am asking what I could be doing wrong? Or not using, rather?