Instancing cubes and coloring them in Unity (c#)

Question

I'm trying to automatically generate cubes in Unity with c#.

I have finally succeed in creating a large number of cubes (300x300), positioning them and naming them, but I have a problem when it comes to colouring them (last part of the code).

I want to colour them by using three variables, one for each RGB value. The variables I define in my code are rnewcolor, gnewcolor and bnewcolor, and they are attributed to each component by using (last part of the code):

go.GetComponent<Renderer>().material.color = new Color(rnewcolor/255f, gnewcolor/255f, bnewcolor/255f)

When I attribute random values to these three variables for example:

int rnewcolor = UnityEngine.Random.Range(0, 255))

then the code works, and the cubes are coloured with random colours as expected (image here https://ibb.co/pXDmhfB )

But when I try to read the RGB values from a file, storing them on the arrangements Rcolor[i,j,k], Gcolor[i,j,k] and Bcolor[i,j,k], to pass them later to the variables rnewcolor, gnewcolor, bnewcolor, then the colour attribution does not work and I get all the cubes with a kind of grey colour which is not the colour read from the file (image https://ibb.co/S3JRnBr )

Some more images:

Inspector on the first cube (used for the instancing): https://ibb.co/VNsCy5b (it has the code "ProgramCubeNew.cs" added as a component) Inspector on the first cube (also in prefab): https://ibb.co/tKrVD2V

Some comments:

By printing some debugging, I know that the variables rnewcolor, gnewcolor, bnewcolor, Rcolor[,,], Gcolor[,,] and Bcolor[,,] are all of the same type, which is Int32.

Also, I know that the values read from the file and stored in the Rcolor[,,], Gcolor[,,] and Bcolor[,,] variables are right.

I know that here:

go.GetComponent<Renderer>().material.color = new Color(rnewcolor/255f, gnewcolor/255f, bnewcolor/255f)

the fucntion Color(,,) works with float numbers ranging from 0 to 1. It works perfectly when random numbers are assigned to the variables gnewcolor, bnewcolor and gnewcolor but it does not work when values are read from the file.

As the colouring process work when using random numbers, i assume that the articulation between objects in the Unity interface must be right (?)

Does anybody knows why I can't attribute the colours when values are read from file?

Thank you!

using System.Collections;
using UnityEngine;
using System;
using System.IO;
using System.Text;


public class ProgramCubeNew : MonoBehaviour
{
    public Int32[,,] Rcolor = new Int32[400, 400, 400];
    public Int32[,,] Gcolor = new Int32[400, 400, 400];
    public Int32[,,] Bcolor = new Int32[400, 400, 400];

    // Start is called before the first frame update
    void Start()
    {
        GameObject prefab = Resources.Load("Cube") as GameObject;
        string path = @"H:\Unity\Learn_Everything_Fast\Cube_script_generation\export_bones_scene\rgb_bones_scene.txt";

        using (var reader = new StreamReader(path))
        {
            while (!reader.EndOfStream)
            {
                var line = reader.ReadLine();
                var values = line.Split(' ');

                int i = Convert.ToInt32(values[0]);
                int j = Convert.ToInt32(values[1]);
                int k = Convert.ToInt32(values[2]);
                Rcolor[i, j, k] =  Convert.ToInt32(values[3]);
                Gcolor[i, j, k] = Convert.ToInt32(values[4]);
                Bcolor[i, j, k] = Convert.ToInt32(values[5]);
            }    
        }

        // I'm using theese three lines in order to know if the file is being read ok, it seems so.
        Debug.Log(Rcolor[50, 50, 50]);
        Debug.Log(Gcolor[50, 50, 50]);
        Debug.Log(Bcolor[50, 50, 50]);

        for (int i = 0; i <= 300; i++)
        {
            for (int j = 0; j <= 300; j++)
            {
                int k = 50;
                string name = string.Format("cube_{0}_{1}_{2}\n", i, j, k);
                string namemat = string.Format("mat_{0}_{1}_{2}\n", i, j, k);
                GameObject go = Instantiate(prefab) as GameObject;
                go.transform.position = new Vector3(i, j + 20, k);
                go.transform.name = name;

                // int rnewcolor = UnityEngine.Random.Range(0, 255); // it works ok
                // int gnewcolor = UnityEngine.Random.Range(0, 255); // it works ok
                // int bnewcolor = UnityEngine.Random.Range(0, 255); // it works ok
                int rnewcolor = Rcolor[i, j, k];               
                int gnewcolor = Gcolor[i, j, k];               
                int bnewcolor = Bcolor[i, j, k];                

                // I'm using this to print some debug
                if (i == 50 && j == 50)
                {
                    Debug.Log(Rcolor[i, j, k]);
                    Debug.Log(Gcolor[i, j, k]);
                    Debug.Log(Bcolor[i, j, k]);
                    Debug.Log(Rcolor[i, j, k].GetType());
                    Debug.Log(Gcolor[i, j, k].GetType());
                    Debug.Log(Bcolor[i, j, k].GetType());
                    Debug.Log(bnewcolor.GetType());
                }

                go.GetComponent<Renderer>().material.color = new Color(rnewcolor/255f,gnewcolor/255f,bnewcolor/255f);
            }
        }
    }

    // Update is called once per frame
    void Update()
    {

    }
}