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
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