Why isn't the color changing?

I made a very simple clock on Unity for practice, but for some reason the color of the hands won’t change. I’m pretty sure I scripted it right and when I hit play the mesh render shows the correct color for the hands but that color isn’t actually displayed. They seem to just stay a grey color. Here’s my script and a screen shot of my Unity window. Thanks.


using UnityEngine;
using System;

public class ClockAnimator : MonoBehaviour {

	private const float
		hoursToDegrees = 360f / 12f,
		minutesToDegrees = 360f / 60f,
		secondsToDegrees = 360f / 60f;
	public Transform hours, minutes, seconds;

	public bool analog;

	void Start () {

		GameObject ClockBack = GameObject.FindGameObjectWithTag ("Back");
		ClockBack.renderer.material.color = Color.black;

		GameObject [] HandsArray = GameObject.FindGameObjectsWithTag ("Hand");
		foreach (GameObject hand in HandsArray) {

			hand.renderer.material.color = Color.yellow;



	void Update () {

		if (analog) {
			TimeSpan timespan = DateTime.Now.TimeOfDay;
			hours.localRotation = Quaternion.Euler (0f, 0f, (float) timespan.TotalHours * -hoursToDegrees);
			minutes.localRotation = Quaternion.Euler (0f, 0f, (float) timespan.TotalMinutes * -minutesToDegrees);
			seconds.localRotation = Quaternion.Euler (0f, 0f, (float) timespan.TotalSeconds * -secondsToDegrees);


		else {

			DateTime time = DateTime.Now;
			hours.localRotation = Quaternion.Euler (0f, 0f, time.Hour * -hoursToDegrees);
			minutes.localRotation = Quaternion.Euler (0f, 0f, time.Minute * -minutesToDegrees);
			seconds.localRotation = Quaternion.Euler (0f, 0f, time.Second * -secondsToDegrees);




You are using a Diffuse shader, which requires a light to display correctly the colors, so just add a directional light rotated to be perpendicular to your clock.