The color for the date and background can be changed in the Settings menu. Access the Settings area and locate the colors mode. You will have the possibility to change the colors for all the available elements on the receipt list. Unfortunately, this is the only way. If you can't find the option, make sure to update the application to latest version. It's possible the option is missing in previous versions. Additionally, you should check the ink levels for your printer and replace or recharge them as necessary.
