Change color of augmented Object (AR Core) at runtime.

I am using the Image Target Detection example from AR Core SDK. I want to change the color of the object at runtime through script. A material is attached to that object.

           // Create an anchor to ensure that ARCore keeps tracking this augmented image.
             Anchor anchor = image.CreateAnchor(image.CenterPose);
             visualizer = (AugmentedImageVisualizer)Instantiate(
                 AugmentedImageVisualizerPrefab, anchor.transform);
             visualizer.Image = image;
             m_Visualizers.Add(image.DatabaseIndex, visualizer);
                 
                             
          Renderer rend = visualizer.GetComponent<Renderer>();
     rend.sharedMaterial.shader = Shader.Find("BaseColor");
     Color red = new Color(255,0,0);
     rend.sharedMaterial.SetColor("_Color", red);

This is my current code which I have tried to implement after taking hint from different answers but nothing seems to work.

,I am using the Image Target Detection Example from AR Core SDK. I need to change the color of the augmented object at runtime through scripting.

                 Renderer rend = visualizer.GetComponent<Renderer>();
                 rend.sharedMaterial.shader = Shader.Find("BaseColor");
                 Color red = new Color(255,0,0);
                 rend.sharedMaterial.SetColor("_Color", red);

This is what every answer is suggesting, but this is not working.