Material turns blue when changing the emission color smoothly

When i select the material in the inspector it changes back to normal. The color intensity variable is changed by the animator. Here is the code i use:

 private IEnumerator TransformShineToSuper()
 {
     if (shining)
     {
         StopCoroutine("TransformShineToSuper");
     }

     shining = true;
     Material shineMaterial = new Material(normalMat);
     normalRenderer.material = shineMaterial;
     shineMaterial.EnableKeyword("_EMISSION");

     while (shining)
     {
         shineMaterial.SetColor("_EmissionColor", Color.yellow * colorIntensity);
         yield return null;
     }
 }

 public void StopShining()
 {
     shining = false;
     characterStats.ChangeModel(true);
     playerAnimation.ChangeAnimForSuperForm(false);
     normalRenderer.material = normalMat;
     colorIntensity = -10;
 }

Here is how the material should look like after StopShining():

Here is what's happening:

Update: You can apparently change the emission in the animator itself and when i did that it worked!