Accessing shader colors

I am trying to edit the secondary color of a custom shader.

Here's the color i am refering to: http://imgur.com/a/yasvO

here is the shader script with the property I want to edit highlighted: http://imgur.com/a/D2vXw

I can change the color of the material to my desired color, but it only changes the main color. What I want is for the "New Color" to change the outline color.

 public void LookedAt()
 {
     Debug.Log("Object is being looked at by player");
     rend.material.color = new Color(255,147,49,255);
 }

Thanks in advance :)