Mammalian blood is NOT blue.
Rh Negative Blood, Also known as Blue Blood (Higher Copper content at birth makes it blue)
Copper
Yes
oxygen is what makes your blood red... you may not know this but when your blood is not seen it is blue
No it stays blue, it only turns blue in the presence of blood
blood
Some animals (like horseshoe crabs) have blue blood because they use hemocyanin carry oxygen to their tissues instead hemoglobin like we do. The copper in the hemocyanin makes their blood appear blue.
Blood never turns blue. It's been argued that it turns blue without oxygen, but this is merely a myth. The blue color you see is the color of the tissue that makes up your veins. Blood will however, take on a darker shade of red without oxygen, but it never goes anywhere near the color blue. If you would like to see for yourself, the next time you get a blood draw, or you donate blood, look at the blood in the tube. The tube is a vacuum (so no oxygen) and the blood does not look blue.
Blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue and red light (being of different wavelengths) penetrate with different degrees of success. What makes it back to your eye is the blue
Some inscets have copper instead of iron in their blood, which makes it bluish rather than reddish.
That's just nature. If it were'NT nature i'd have like pink-blue blood and you would have like black blood....
No, penguins do not have blue blood. An animal who does have blue blood is the lobster and lizards have green blood.