measuring blueness

Delving into Blue(ts) Today I have been reading about cyanometry and the cyanometer. CYANOMETRY: The study and measurement of the blueness of light; the measurement of intensity of blue light, especially of the blue of the sky. The cyanometer is attributed to Horace-Bénédict de Saussure (1740–99), a Swiss physicist and geologist, famous for his studies of the…