Color.operator -

Subtracts color b from color a. Each component is subtracted separately.

JavaScripts

// magenta - blue = red
var redColor : Color = Color.magenta - Color.blue;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public Color redColor = Color.magenta - Color.blue;
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public redColor as Color = (Color.magenta - Color.blue)