This tools colors all the text in a subtitle file.
Adding color to subtitles can improve readability and make the text more noticeable.
If you want to remove colors from an srt file, you can use the srt cleaner tool.
Not all video players and televisions support colored subtitles. If you have used this tool to apply a color, but the subtitles are still white, then unfortunately there isn't much you can do. A lot of devices simply don't support styling in subtitle files.