Not able to display color in excel

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MS-Excel

color

Hi, I have the following code for a text displayed in excel cell.

<style Halign="center" Valign="center" wrapText="true" includeAlign="true" includeFont="true" includeBorder="true">
  Pass_indicator
  <font  font="Arial" size="12" bold="true" italic="true" underline="None" Color = "Red" />
</style>

When I Call this code from C# as

AddCellHeaderRowStyle_color(bool2str(PassFailStatusOverAll), 2, htBaseFormat, data);

where the function definition is as below

private void AddCellHeaderRowStyle_color(string cellValue, int column, Hashtable htBaseFormat, ArrayList rowData)
{
    Hashtable htModifiedFormat = (Hashtable)htBaseFormat.Clone();
    htModifiedFormat[Common.COLUMNCOUNT] = column.ToString();
    htModifiedFormat[Common.ROWHEIGHT] = "36";
    htModifiedFormat[Common.STYLENAME] = "Pass_indicator";
    rowData.Add(cellValue);
    rowData.Add(htModifiedFormat);
}

in excel file, The text changes as I change the size, bold, italic attributes but not the color. I tried changing color to "#00FF00", putting it before other attributes but nothing works.