Margot in Nautical Flags. French names have similar origins to those of other old-world European nations. They are often derivations of place names or trade names, or have their basis in history, mythology, religion or nature. They may also be created names.
Umber is not one precise color, but a range of different colors, from medium to dark, from yellowish to reddish to grayish. The color of the natural earth depends upon the amount of iron oxide and manganese in the clay.
Uranium glass has an unusual yellow-green color and glows in ultraviolet light. These glass pieces were made using waste uranium from the cleanup of the Fernald uranium processing plant near Cincinnati, Ohio, USA. Vitrification (turning a material into glass) is one way to dispose of nuclear waste safely.