glass, the simplest of glass, naturally has a pale shade of green. with effort, and other mineral salts added, it becomes clear, or a range of colors (cranberry glass= gold salts, pure crystal = lead salts, blue = coblat, etc.)

i think the blue paper was something akin to blue print paper, and could be copied.. but deep blue (royal blue almost) was used to wrap up sugar cones..(no idea why)


my other obsession