Color.a

var a : float

Description

Alpha component of the color.

JavaScript
    var color : Color = Color.white;
color.a = 0;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public Color color = Color.white;
void Example() {
color.a = 0;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public color as Color = Color.white

def Example():
color.a = 0