VBA to set fill color on Excel Charts

I have some code that someone helped me with

Sub ColourCells(rngIn As Range)
    Dim rngcell As Range
    Dim iColor As Long
    For Each rngcell In rngIn
        With rngcell
            Select Case .Value
     
                Case "Book Value per Share to Price", "Cashflow per Share to Price", "Dividend Yield", "Earnings per Share to Price", "EBITDA to EV", "EBITDA to Price", "IBES Dividend Yield", "IBES Earnings Yield", "IBES Sales Yield", "Sales per Share to Price", "Sales to EV", "Free Cashflow Yield"
         
                    iColor = 5
                    .Font.Color = RGB(255, 255, 255)
                     
                Case "Growth in Earnings per Share", "IBES 12 Month Forward  Growth in Earnings per Share", "IBES Earnings Long Term Growth", "IBES FY1  Earnings Revisions 1M Sample", "IBES FY1  Earnings Revisions 3M Sample", "IBES FY2  Earnings Revisions 1M Sample", "IBES FY2  Earnings Revisions 3M Sample", "IBES Sales 12 Mth Growth", "IBES Sales Long Term Growth", "Income to Sales", "Return on Equity", "Sales Growth", "Sustainable Growth Rate"
         
                    iColor = 10
                    .Font.Color = RGB(255, 255, 255)
                    
                Case "Beta", "Market Cap (Large Cap)*"
         
                    iColor = 3
                    .Font.Color = RGB(255, 255, 255)
                     
                Case "Momentum 12 Mth", "Momentum 6 Mth", "Momentum Short Term (6 Month Exp Wtd)"
         
                    iColor = 1
                    .Font.Color = RGB(255, 255, 255)
                     
                Case "Debt to Equity", "Foreign Sales as a % Total Sales"
         
                    iColor = 6
                    .Font.Color = RGB(0, 0, 0)
                     
                Case "Low Gearing", "Low Accruals", "Stability Of Earnings Growth", "Stability Of FY1 Revisions", "Stability Of IBES 12 Mth Growth Forecast", "Stability of Returns", "Stability Of Sales Growth"
         
                    iColor = 18
                    .Font.Color = RGB(255, 255, 255)
                Case Else
         
                    'Whatever
         
            End Select
         
             
         
            .Interior.ColorIndex = iColor
        End With
    Next rngcell
 
End Sub

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awhile ago.  I need to be able to use the RGB colors instead of what I am currently using for fill colors on excel bar charts.