oxy / deoxy

LITThe curves are the measured molar extinction spectra of oxy- and deoxyhaemoglobin compiled by Scott Prahl (OMLC). Both absorb most strongly in the Soret band, oxy near 415 nm and deoxy near 430 nm. Oxy has twin Q-bands near 542 and 577 nm, and deoxy a single band near 555 nm. At 660 nm deoxy absorbs about ten times more than oxy, which is the red half of how a pulse oximeter works.

COMPUTEDBlood colour comes from Beer–Lambert transmission through a thin layer (150 g/L haemoglobin, path-length slider) under an equal-energy white, through CIE with Bradford. Saturation mixes the two measured spectra. Veins look blue through skin for scattering reasons, not because the blood is blue; this page shows the blood itself. Nesting: an orange core, the purple of deoxy, green, yellow and blue shells (nothing absorbs there but the Q-bands), red oxy blood, the void.

SO₂ path µm

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