gary Thank you for explaining why blood is red. I appreciate your response.

For anyone else that has a similar question to mine, I found this answer:

Superman's blood is typically depicted as red, just like that of an average human. This is consistent across most versions of the character in comics, movies, and television. Despite his alien physiology as a Kryptonian, his blood appears red because it contains hemoglobin-like substances that function similarly to human blood. This portrayal aligns with his overall humanoid appearance and compatibility with Earth's environment.