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Compound Interest | Chemistry infographics @compoundchem.com · 07/10/2026

Today is #WorldOctopusDay 🐙 Did you know that octopuses have blue blood? This graphic looks at what makes it blue, as well as other blood colours seen in different organisms: wp.me/p4aPLT-Fc #ChemSky 🧪

Infographic on the chemistry of the colours of blood. Human blood is red due to haemoglobin, which is also red when deoxygenated - not blue! Spiders, crustaceans, and molluscs including octopuses and squid have blue blood due to haemocyanin, which contains copper instead of iron. When deoxygenated, haemocyanin is colourless. Some segmented worms, some leeches and some marines worms have green blood due to chlorocruorin, which is light green when deoxygenated. Marine worms including peanut worms, penis worms and brachiopods have purple blood due to haemerythrin, which is colourless when deoxygenated.

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🏳️‍⚧️ Sawyer Skunk @stinkysonas.bsky.social · 08/10/2026

It's interesting to think that octopus and horseshoe crabs both have blue blood. The evolution of crustaceans and mollusks are *wild* (or lack of evolution in horseshoe crabs lol)

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