Color32.Color32  

var color : Color32 = Color(0.2, 0.3, 0.4, 0.5);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Color32 color = new Color(0.2F, 0.3F, 0.4F, 0.5F);
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public color as Color32 = Color(0.2F, 0.3F, 0.4F, 0.5F)