In a post earlier this year, we brought to your attention Werner’s Nomenclature of Colours. Used by artists and naturalists alike, the guide originally relied on written description alone, without any color to be found among its pages. Instead, in the late eighteenth century, German mineralogist Abraham Gottlob Werner painstakingly detailed the qualities of the 110 colors he surveyed, by reference to where they might be found on animals, vegetables, and minerals. The color “Pearl Gray,” for example, might be located on the “Backs of black headed and Kittwake Gulls,” the “Back of Petals of Purple Hetatica,” or on “Porcelain Jasper.”