title: Unity3d - Particles/Additive displays white instead of black
body: <p>Particles/Additive on a <code>LineRenderer</code> displays white instead of black. Any idea what is the problem?</p>
  
  <pre><code> Color edge_color=Color.black;
   edge_color.a = 0.7f;
   GameObject go = new GameObject ();
   var rend=go.AddComponent&lt;LineRenderer&gt; ();
   rend.useWorldSpace = false;
   rend.startWidth = 0.05f;
   rend.endWidth = 0.05f;
   rend.material = new Material(Shader.Find("Mobile/Particles/Additive"));
   rend.material.color = edge_color;
   //rend.SetPositions (...);
  </code></pre>