I can't dynamically change the color of my particles

I'm having a problem changing the color of the particles dynamically. The code below allows me to select any number of colors and put them in a colors array. From there, I randomly select a color in Start() and save that value in myColor. Since it is saved to a global variable, I should be able to use it later right?

Well, this is where it gets tricky: I can assign that color to the material of the Something object. That seems to work fine. Then, I go to KillSomething(). If I Debug.Log myColor, it tells me its whatever color I'm expecting it to be. If I assign it to the particle startColor, though, I get nothing. If I hard code in a specific startColor (as shown below), the particles will show that color.

Why won't temp.startColor = myColor; work? But temp.startColor = Color.red; will?

 public class Something : MonoBehaviour {
 public Color[] colors;
 public Material somethingColor;
 public GameObject confetti;
 [HideInInspector]
 public Color myColor;

 void Start(){
     this.myColor = colors[Random.Range(0, colors.Length)];
     this.gameObject.transform.Find("Somethin/whatever").GetComponent<Renderer>().material.color = myColor;
 }

 public void KillSomething(){
 var c = Instantiate(confetti, transform.Find("Somethin/whatever").position, Quaternion.identity);
 var temp = c.transform.Find("Pieces").GetComponent<ParticleSystem>().main;
 temp.startColor = Color.red;
 Debug.Log(myColor.ToString());
 Destroy(c, 2f);
 Destroy(gameObject);
 }