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  • Photoflora

    Cyanometer | an instrument that measures the blueness of the sky | Horace-Bénédict de Saussure | 1876 | Using suspensions of Prussian blue, Saussure dyed paper squares every shade of blue he could distinguish between white & black, then assembled them into a numbered colour circle that could be held up to the zenith at a standard distance from the eye - the matching square established the degree of blue.

  • Jess Bennett

    Colours. Saussure cyanometer- how blue is the sky...

  • Marsha van Rooijen

    Cyanometer, by Horace-Bénédict de Saussure. An instrument that measures the blueness of the sky. #color #blue

  • Brooke Van Clee

    blue color wheel

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