More Magical, Turbulent History of The Color Green

http://www.printmag.com/color/more-magical-turbulent-history-of-the-color-green/?lid=JFprnl111214&j=703042&e=shutaleva@gmail.com&l=115970_HTML&u=25399650&mid=1303284&jb=668&et_mid=703042&rid=248939721
The trickiness of dyeing in the color green was compounded by medieval guildsmen rules that forbade mixing blue with yellow. Indeed the dyeing trade was so specialized, those craftsmen who worked in blue were forbidden to work in other colors, particularly yellow – making it nearly impossible even to experiment with mixing the two colors.