Glass colour

Clearly then, in glasses coloured by metal ions, the co-ordination chemistry of the transition metal ion has a major influence on the colour. The other major influence is the oxidation state of the metal ion, since variable valency is another characteristic of the transition metals. All other things being equal, for example, iron in the Fe11 form will give a pale blue colour, whereas Fem gives... 

The preparation of reference standards in this procedure is a tedious task and may require considerable time. Time can be saved by applying what is called a permanent colour standard method, which requires a special device, the so-called comparator. The Lovibond comparator, shown on Fig. 1.8 employs nine permanent glass colour standards, fitted on a revolving disc. The device is fitted... 

Puche-Roig A, Martin VP, Murcia-Mascaros S, Puchades RI. Float glass colouring by ion exchange. Journal of Cultural Heritage, 2008 9 129-133. 

All architectural fabrics have been found to have a lower embodied energy compared to traditional materials (such as glass)" Coloured fabrics are available... 

Signal Glass. Coloured glass for light signals on railways, roads, airfields and at sea the glass must conform to a close specification (B.S. 1376). 

Solid Solid Solid sol Alloys, glasses coloured with dispersed metals, e.g., ruby glass, gems, pearls. 

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