Why is my object loading as black instead of the saved color?

I'm writing a script to save and load a color that the user picks for the 3D object (could be a cube, cylinder, or sphere) via button presses, but when I try loading the object in, it's just black. I've double checked and the right RGB values are being saved and loaded, but the object just appears to be black. Also, for now, I'm just testing the loading output with a default color, which is red in my case. Why is this happening and how can I fix it?

Important Note: I made a "private Renderer rend;" at the top of the class, and then defined rend ("rend =...") in the void Start() section.

         // Changing the color via key presses
 
         if (Input.GetKeyDown(KeyCode.R))
         {
             rend.material.SetColor("_Color", Color.red);
         }
         if (Input.GetKeyDown(KeyCode.G))
         {
             rend.material.SetColor("_Color", Color.green);
         }
         if (Input.GetKeyDown(KeyCode.B))
         {
             rend.material.SetColor("_Color", Color.blue);
         }

        // To add button elements to the visual interface
        void OnGUI() 
        {
            // Saving
            if (GUI.Button(new Rect(700, 330, 50, 30), "Save"))
            {
                 // Saving the object's color 
                 Color colorOfObject = rend.material.GetColor("_Color");
                 PlayerPrefs.SetFloat("rValue", colorOfObject.r);
                 PlayerPrefs.SetFloat("gValue", colorOfObject.g);
                 PlayerPrefs.SetFloat("bValue", colorOfObject.b);
         }
 
         // Loading
         if (GUI.Button(new Rect(770, 330, 50, 30), "Load"))
         {
             Color defaultColor = Color.red;
             Color colorOfObject = new Color(PlayerPrefs.GetFloat("rValue", defaultColor.r), 
             PlayerPrefs.GetFloat("gValue", defaultColor.g), PlayerPrefs.GetFloat("bValue", defaultColor.b));
             rend.material.SetColor("_Color", colorOfObject);
         }