Body tinted glass products are produced by small additions of metal oxides to the float or rolled glass composition. These small additions colour the glass
bronze, green, blue or grey but do not affect the basic properties of the glass except for changes in the solar energy transmission. The colour is homogeneous throughout the thickness.
Most float glass products contain small amounts of iron oxide which produce a green tint usually only perceived when the glass pane is viewed 'on edge'. Additional iron oxide is introduced to produce green tint, cobalt
oxide for grey tint and selenium oxide for bronze tint. To produce a blue tint additional cobalt oxide is added to the float glass composition. These products are perceived as giving weak colours by transmitted light. They do not produce high or significantly
coloured reflectances. Usually their principal external visual characteristic is their lower light transmission. Coated glass products with high light reflectances can exhibit stronger exterior colours than those of body tinted glass.
Transmitted light through the glass, from the building interior, diminishes the perceived effect of these reflected external colours of coated glass. Conversely, such
light increases the perceived transmitted colours. Since most coated reflective glass products also exhibit colour by transmission, the transmitted coloured light from the building interior will also be seen externally in conjunction with the reflected colours
producing complicated colour appearances