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);
 
         }
 
     }
 
 }