@bit_wonder: Why Isn't All Blood Red? 🎧 Why isn't all blood red? The color comes from the oxygen-carrying molecule built around its metal: iron in hemoglobin makes ours red, and copper in hemocyanin makes a horseshoe crab's blood blue, but only when it holds oxygen. A paint palette of real blood colors: red hemoglobin (iron), blue hemocyanin (copper, clear without oxygen), green chlorocruorin in some fanworms (iron again), violet hemerythrin in peanut worms, and the Antarctic icefish, whose blood has no hemoglobin and is clear. Then the twist: your veins look blue, but the blood inside is dark red. Human blood is never blue; your skin scatters the light. Sources: Kienle et al. 1996, "Why do veins appear blue? A new look at an old question", Applied Optics Ruud 1954, "Vertebrates without Erythrocytes and Blood Pigment", Nature Wikipedia, "Hemocyanin" Wikipedia, "Respiratory pigment" Note: We use AI agents such as Codex and Claude Code to assist with production. All videos are based on human ideas, created under human direction, and reviewed for accuracy. AI and human reviewers can miss mistakes. Please let us know in the comments if you spot any inaccuracies. #bloodcolors #biology #pixelart #creativecoding #bitwonder

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Monday 09 November 2026 08:02:24 GMT