Thanks again for the reply but I'm still stuck. If WriteExcel does not let me rewrite and existing spreadsheet and SaveParser does not let me 'set_color' I only see a brute force method to do what I need. I would have to use WriteExcel to create a new spreadsheet, then delete the old one and rename the new one. It seems like I am missing something or there is a big hole in these modules.

P.S. If there is no 'set_color' method in SaverParser, why am I not getting a run time error when I try to use it?