Kleurcode dubbele vermeldingen in een veld van een Excel met afwisselende kleuren

Het proces waar je het over hebt heet 'duplicate banding'. Een paar Scripting.Dictionary objecten zouden hier gemakkelijk voor moeten zorgen.

Sub colorDuplicateColor2()
    Dim d As Long, dODDs As Object, dEVNs As Object, vTMPs As Variant
    Dim bOE As Boolean
    
    Set dODDs = CreateObject("Scripting.Dictionary")
    Set dEVNs = CreateObject("Scripting.Dictionary")
    dODDs.CompareMode = vbTextCompare
    dEVNs.CompareMode = vbTextCompare
    
    With Worksheets("Sheet7")
        If .AutoFilterMode Then .AutoFilterMode = False
        
        With .Range(.Cells(1, "C"), .Cells(Rows.Count, "C").End(xlUp))
            
            With .Columns(1)
                .Cells.Interior.Pattern = xlNone
            End With
            
            With .Resize(.Rows.Count - 1, 1).Offset(1, 0)
                vTMPs = .Value2
            End With
            
            For d = LBound(vTMPs, 1) To UBound(vTMPs, 1)
                'the dictionary Items have to be strings to be used as filter criteria
                If Not (dODDs.exists(vTMPs(d, 1)) Or dEVNs.exists(vTMPs(d, 1))) Then
                    If bOE Then
                        dODDs.Item(vTMPs(d, 1)) = CStr(vTMPs(d, 1))
                    Else
                        dEVNs.Item(vTMPs(d, 1)) = CStr(vTMPs(d, 1))
                    End If
                    bOE = Not bOE
                End If
            Next d
            
            With .Columns(1)
                .AutoFilter Field:=1, Criteria1:=dODDs.Items, Operator:=xlFilterValues
                .SpecialCells(xlCellTypeVisible).Interior.Color = RGB(210, 210, 210)
                'use this to band the entire row
                '.SpecialCells(xlCellTypeVisible).EntireRow.Interior.Color = RGB(210, 210, 210)
                'use this to band the row within the UsedRange
                'Intersect(.Parent.UsedRange, .SpecialCells(xlCellTypeVisible).EntireRow).Interior.Color = RGB(210, 210, 210)
                .AutoFilter
                .AutoFilter Field:=1, Criteria1:=dEVNs.Items, Operator:=xlFilterValues
                .SpecialCells(xlCellTypeVisible).Interior.Color = RGB(255, 200, 200)
                .Cells(1).EntireRow.Interior.Pattern = xlNone
            End With
            
        End With
        
        If .AutoFilterMode Then .AutoFilterMode = False
    End With
    
    dODDs.RemoveAll: Set dODDs = Nothing
    dEVNs.RemoveAll: Set dEVNs = Nothing
    Erase vTMPs

End Sub

De gegevens moeten natuurlijk worden gesorteerd op de kolom met dubbele criteria.

Dit proces kan eenvoudig worden aangepast voor banding van volledige rijen of rijen binnen datablokken.