Koreef,
The examples below assume you are working with embedded charts:
To change all of the series colors for all charts in a worksheet (edit out
the markers if you don't want them):
Sub LoopSeries()
Dim ws As Worksheet
Dim ct As ChartObject
Dim ser As Series
For Each ws In Worksheets
For Each ct In ws.ChartObjects
For Each ser In ct.Chart.SeriesCollection
ser.Border.ColorIndex = 3
ser.MarkerForegroundColorIndex = 3
ser.MarkerBackgroundColorIndex = 3
Next ser
Next ct
Next ws
End Sub
If you just want to do one chart, you can activate it by clicking on it
once. Then run this:
Sub LoopSeries()
Set cht = ActiveChart
Set Srs = cht.SeriesCollection
For Each Sr In Srs
Sr.Border.ColorIndex = 3
Next Sr
End Sub
Another option that goes after the first chart in the workbook:
Sub LoopSeries()
Set cht = ActiveSheet.ChartObjects(1).Chart
Set Srs = cht.SeriesCollection
For Each Sr In Srs
Sr.Border.ColorIndex = 3
Next Sr
End Sub
Finally, use this logic to go after a named embedded chart:
Sub LoopSeries()
Set cht = ActiveSheet.ChartObjects("Chart 1")
Set Srs = cht.Chart.SeriesCollection
For Each Sr In Srs
Sr.Border.ColorIndex = 3
Next Sr
End Sub
Please post back if you are referring to chart sheets.