Is human blood ever any color other than red?

Why does blood seem blue or green underwater? - Quora

How does the gene T control ABO blood group in humans? Write the

Roses Are Red and So Is . . . Blood? – Biomedical Beat Blog

Is it possible for blood to have a different color than red? - Quora

Roses Are Red and So Is . . . Blood? – Biomedical Beat Blog

Do humans have blue blood?

Did You Know That Not All Blood is Red? • The Blood Project

How Many Types of Blood Groups

Is human blood ever any color other than red? - Meme and knowledge

What is the color of our blood? - Quora