Hello actionphotos,

Sorry I just noticed that you mentioned the text color and not the background color.

#!/usr/bin/perl
use strict;
use warnings;
use Excel::Writer::XLSX;

# Create a new Excel workbook
my $workbook = Excel::Writer::XLSX->new( 'perl.xlsx' );

# Add a worksheet
my $worksheet = $workbook->add_worksheet();

# Write a formatted and unformatted string, row and column notation.
$worksheet->write( 'C3', 'Hi Excel!');
$worksheet->write_comment( 'C3', 'Comment with Color', color => 'green
+' );
[download]

You can read more about the other options here Excel::Writer::XLSX/write_comment( $row, $column, $string, ... ).

Update: Reading again and again the documentation I do not think so it is possible to update the character color of the comment. You can update the character colors of the spreadsheet yes, but not the comments. In case you find a solution to your problem can you also share it here so someone else in the future might benefit from it.

Hope this helps, BR.