CHAPTER XI.

COLOURED GLASSES.

Definition of coloured glass--Physical causes of colour-- Colouring substances: copper, silver, gold, carbon, tin, arsenic, sulphur, chromium, uranium, fluorine, manganese, iron, nickel, cobalt--Range and depths of tints available--Intensely coloured glasses--The process of “flashing”--Character of “flashed” glass--Colours produced on glass by painting: use of coloured “glazes” as paints--Ancient stained glass and modern glass-- Technical uses of coloured glass, photography, railway and marine signals _p._ 178