Fade out effect when i change images from a list of textures

Hello, I have this script that basically lets me change textures from a list of textures i set when i click the keyboard button J. Is there a way to make the transition from one image to another not abrupt ? make it have a dim or a fade out smooth effect ?

Thank you :)

public var textureList : Texture[] ; public var objectList : GameObject[]; public var textureNumber : int; var coolDown : int = 1; var lastClickTime : float; var inTrigger : boolean = false;

 function Update ()
 {
         if (Input.GetKeyDown(KeyCode.J) && inTrigger == true)
         {
             if(lastClickTime + coolDown < Time.time)
             {
                 lastClickTime = Time.time;
 
                 textureNumber ++;
                 if (textureNumber > textureList.length - 1)
                 {
                     textureNumber = 0;
                 }
 
 
                 for (var i = 0; i < objectList.length;  i++)
                 {    
                     objectList[i].GetComponent.<Renderer>().material.mainTexture = textureList[textureNumber];
                 }
         }
 
     }
 }