Color.operator -

Description

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

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

using UnityEngine;
using System.Collections;

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

import UnityEngine
import System.Collections

public class ExampleClass(MonoBehaviour):

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