var w : Color32 = Color.white;
print(w.ToString("x"));

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Color32 w = Color.white;
    void Example() {
        print(w.ToString("x"));
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public w as Color32 = Color.white

    def Example():
        print(w.ToString('x'))