How do you fix a check with two different pens?

To fix a check written with two different pens, start by carefully erasing or using correction fluid to cover the ink from the pen you want to remove. Then, rewrite the necessary information with a single pen, preferably a blue or black ink pen that is consistent with the rest of the check. Ensure that all details are clear and legible to avoid any issues during processing. Finally, check with your bank for any specific policies regarding corrected checks.