Cyanometer colour 0 (Q425000)

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Revision as of 19:37, 15 July 2022 by Olaf Simons (talk | contribs) (‎Removed [en] description: an instrument for measuring "blueness", specifically the colour intensity of blue sky, attributed to Horace-Bénédict de Saussure and Alexander von Humboldt)
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Cyanometer colour 0
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