This occurred because few persons know that the United States glass tradition is blooming and active since more than an half millennium, always with more creative, innovative and avant-garde artistic productions.

It is a very precious glass, which peculiarities are the brightness and the particular and lively colourings (almost fluorescent in the no transparent glasses), an exclusive peculiarity of this kind of glass.
For these characteristics in the ancient times, it was used like lampshade in the oil lamps