Mathf.CorrelatedColorTemperatureToRGB how to reverse the action ?

Do some one got any idea how to reverse
Mathf.CorrelatedColorTemperatureToRGB

Color ==> color temperature.

In other words. How to reverse action.

For now test this metod and it works good.

[ExecuteInEditMode]

public class TestClass : MonoBehaviour {

    public float kelvin;

    public float red;

    public float green;

    public float blue;

    public Color color;

    // Use this for initialization

    void Start ()

    {

        kelvin = 1000;

    }   

    // Update is called once per frame

    void Update ()

    {

        ColorTemperatureToRGB();

        red = color.r;

        green = color.g;

        blue = color.b;

    }

    public void ColorTemperatureToRGB()

    {

        var red = 0;

        var green = 0;

        var blue = 0;

        color = new Color(red, green, blue);       

        if (kelvin >= 1000)

        {

            color = Mathf.CorrelatedColorTemperatureToRGB(kelvin);

         // Debug.Log("Kelvin >= 1000");

        }

       // Debug.Log(color.r);

       // Debug.Log(color.g);

       // Debug.Log(color.b);

    }

    public void RGBToColorTemperature()

        {

         // :-/

        } 

}

RGDS

 

There's plenty of prior art on this. The google found me this:

http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/

Seems to discuss formulae and from that you could infer reversibility or not.