This Unity tutorial show how to change/fade/animate colors over time.

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Set the color script:

/*

   .-------.                             .--.    .-------.     .--.            .--.     .--.        
   |       |--.--.--------.-----.-----.--|  |    |_     _|--.--|  |_.-----.----|__|---.-|  |-----.
   |   -   |_   _|        |  _  |     |  _  |      |   | |  |  |   _|  _  |   _|  |  _  |  |__ --|
   |_______|__.__|__|__|__|_____|__|__|_____|      |___| |_____|____|_____|__| |__|___._|__|_____|
   © 2019 OXMOND / www.oxmond.com 

*/

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;

public class ChangeColor : MonoBehaviour
{

    public Material nMaterial;

    public void SetColorToBlack() {
        nMaterial.SetColor("_Color", Color.black);
    }

    public void SetColorToWhite()
    {
        nMaterial.SetColor("_Color", Color.white);
    }

    public void SetColorToRed()
    {
        nMaterial.SetColor("_Color", Color.red);
    }

    public void SetColorToGreen()
    {
        nMaterial.SetColor("_Color", Color.green);
    }


}

Fade the color using DOTween:

/*

   .-------.                             .--.    .-------.     .--.            .--.     .--.        
   |       |--.--.--------.-----.-----.--|  |    |_     _|--.--|  |_.-----.----|__|---.-|  |-----.
   |   -   |_   _|        |  _  |     |  _  |      |   | |  |  |   _|  _  |   _|  |  _  |  |__ --|
   |_______|__.__|__|__|__|_____|__|__|_____|      |___| |_____|____|_____|__| |__|___._|__|_____|
   © 2019 OXMOND / www.oxmond.com 

*/

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;

public class ChangeColor : MonoBehaviour
{
    public Material nMaterial;

    public void SetColorToBlack() {
        nMaterial.DOColor(Color.black, 2);
    }

    public void SetColorToWhite()
    {
        nMaterial.DOColor(Color.white, 2);
    }

    public void SetColorToRed()
    {
        nMaterial.DOColor(Color.red, 2);
    }

    public void SetColorToGreen()
    {
        nMaterial.DOColor(Color.green, 2);
    }
}