There are other special types of glass and back painted glass by adding different substances. For example:
|Alumina||It improves chemical resistance and increases viscosity in lower temperature ranges|
|Cerium||To absorb infrared rays|
|Coloring agents||Metals and metal oxides to change color (ex. manganese and selenium to decolorized gas, cobalt for blue, copper for red, nickel produces blue, violet or black glass, titanium produces yellowish-brown, etc.).|
|Barium oxide||Glass containing barium is not quite as heavy as lead crystal, but achieves similar brilliance due to its high refractive index.|
|Fluorine||Fluorine-containing materials, such as fluorspar (CaF2) or phosphates to form small crystalline particles in the glass which gives them a cloudy and opaque impression|
|Recently developed forms of glass include:– Safety glass, constructed of two pieces of plate glass join by a plastic to prevent the glass from scattering when broken.
– Fiberglass made from molten glass formed into continuous filaments that is used for fabrics or electrical insulation
– Foam glass made by trapping gas bubbles in glass to produce a spongy material for insulating purposes.