The colorful shiny glass Jane Tivol uses is called dichroic glass. Dichroic Glass is a multi layer coating created by melting quartz crystal and metal oxides. The vapor then attaches and condenses onto the surface of the glass, forming a crystal structure comprised of as many as 30 layers of these materials. Jane Tivol glass pieces are food safe but should not be used in a microwave or put in a dishwasher.
Click here to view a few Kurtulan peices.