itscolossal: Hot on the heels of a post earlier this week about centuries-old guide for mixing watercolors, I stumbled onto this 18th century instrument designed to measure the blueness of the sky called a Cyanometer. The simple device was invented in

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itscolossal: Hot on the heels of a post earlier this week about centuries-old guide for mixing watercolors, I stumbled onto this 18th century instrument designed to measure the blueness of the sky called a Cyanometer. The simple device was invented in

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