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