expression.Colors(Index)
expression Required. An expression that returns one of the objects in the Applies To list.
Index Optional Variant. The color number (from 1 to 56). If this argument isn’t specified, this method returns an array that contains all 56 of the colors in the palette.
Example
This example sets color five in the color palette for the active chart.
ActiveChart.Colors(5) = RGB(255, 0, 0)