Returns or sets a Variant value that represents the color of all four borders.
expression A variable that represents a Borders object.
This property returns Null if all four borders aren't the same color.
The color is specified as an index value into the current color palette, or as one of the following XlColorIndex constants: xlColorIndexAutomatic or xlColorIndexNone.
The following example sets the borders color of the range B2:E5 to xlColorIndexAutomatic (Automatic color).
ActiveSheet.Range("B2:E5").Borders.ColorIndex = xlColorIndexAutomatic