Tinted or coloured glass is fairly common so calling it specialty glass seems a little strange. However, it is a specialty glass product. Tinted glass comes in a variety of colours but red, amber, green, black, grey and blue tend to be the most common.
Tinted glass can be opaque, clear or translucent. It can also be combined with other glass manufacturing techniques like frosting, patterning, etching and tempering.
You can also get tinted glass by applying a thin laminate film to the glass surface. However, it doesn't offer UV protection that true tinted glass overs.