🩸 Blood Can Actually Turn “Blue” — Inside Your Veins (Sort Of)
Contrary to the old myth, your blood itself is never truly blue — but here’s the twist: inside your veins, it can appear blue to the naked eye due to how light penetrates skin and how different wavelengths are absorbed or reflected. The illusion is so strong that surgeons often refer to “blue blood” during operations!
Surprising fact: Vein blood is darker and richer in carbon dioxide — but if you expose it to oxygen, it instantly brightens to a vivid red again.
