Compter cellules de couleurs

Function cellCouleurVide(plage As Range, couleur As Range)
    Dim pl As Range, c As Range, coul As Long
    Application.Volatile
    Set pl = Intersect(plage, Application.Caller.Worksheet.UsedRange)
    If Not pl Is Nothing Then
        coul = couleur.Interior.ColorIndex
        For Each c In pl
            If c = "" And c.Interior.ColorIndex = coul Then cellCouleurVide = cellCouleurVide + 1
        Next c
    End If
End Function