It makes me happy that there are people in the world who, when I idly wonder about something, have already done the research.

The iridescence you see sometimes see in meat, especially bacon, is likely caused by alternating muscle layers acting as a photonic crystal.

This is different to a more obvious interference related hypothesis that it's just striation on the surface acting a bit like a diffraction grating.

academic.oup.com/ijfst/article

Update: also see ift.onlinelibrary.wiley.com/do

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