[Forticsl-progetto] ief survey throughout the past century.

[Riesgraf Furnace]

Ngs available for this purpose. Few of these show any appreciable
degree of permanency. Permanent superficial colorings have recently
been developed, but these are secret processes unavailable for the
market. For this reason

colored glass is the only medium generally available where permanency
is desired.
For permanent lighting effects, signal glasses, colored caps, and
sheets of colored glass may be used. Tints may be obtained by means of
colored reflectors. Other colored media
are dyes in lacquers and in var
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