how can i change the color of line renderer

i am new to unity i have set the width and color for the line that should appear when i swipe the screen..but its not working,dont know whether my code is wrong

now i am getting a pink color line while swiping on the screen.how can i change that color to white. also is it possible to reduce the width of line...

       using UnityEngine;
      using System.Collections;

      public class LinesHandler : MonoBehaviour
     {
      public Color c1 = Color.yellow;
       public Color c2 = Color.red;

 private GameObject lineGO;
 private LineRenderer lineRenderer;
 private int i = 0;

 void Start()
 {
     lineGO = new GameObject("Line");
     lineGO.AddComponent<LineRenderer>();
     lineRenderer = lineGO.GetComponent<LineRenderer>();
     lineRenderer.material = new Material(Shader.Find("Mobile/Particles/Additive"));
     //lineRenderer.SetColors(c1, c2);
     lineRenderer.SetWidth(0.05F, 0);
     lineRenderer.SetVertexCount(0);
 }
 
 void Update()
 {
     if (Input.touchCount > 0)
     {
         Touch touch = Input.GetTouch(0);

         if(touch.phase == TouchPhase.Moved)
         {
             lineRenderer.SetVertexCount(i+1);
             Vector3 mPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 15);
             lineRenderer.SetPosition(i, Camera.main.ScreenToWorldPoint(mPosition));
             i++;
             
             /* Add Collider */
             
             BoxCollider bc = lineGO.AddComponent<BoxCollider>();
             bc.transform.position = lineRenderer.transform.position;
             bc.size = new Vector3(0.1f, 0.1f, 0.1f);
         }
         
         if(touch.phase == TouchPhase.Ended)
         {
             /* Remove Line */
             
             lineRenderer.SetVertexCount(0);
             i = 0;
             
             /* Remove Line Colliders */
             
             BoxCollider[] lineColliders = lineGO.GetComponents<BoxCollider>();
             
             foreach(BoxCollider b in lineColliders)
             {
                 Destroy(b);
             }
         }
     }
 }
     }