What Color Is My Hoodie?

Grey? Blue? Purple? It can look different, depending on the context. Let us discuss color perception, color temperature, and the history of laundry.

Atmospheric opacity pic from ESA/Hubble (F. Granato): https://www.eso.org/public/images/atm_opacity/ – image licensed under CC by 4.0 – https://creativecommons.org/licenses/by/4.0/

More on Illuminant D65: https://en.wikipedia.org/wiki/Illuminant_D65 – the references in this article go into the full technical detail

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