Cyanometer

but how does each blue see the other blues?

cyan

http://www.rsc.org/chemistryworld/Issues/2010/October/SaussuresCyanometer.asp

“how to measure ‘blueness’? Using suspensions of Prussian blue, Saussure dyed paper squares every shade of blue he could distinguish between white and black. These were assembled 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.”

Screen Shot 2016-03-21 at 10.50.21 PM.png
archive images from Land Art Mongolia 3rd Biennial, HS 2014 uurga-irregularloop.com

 

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