The practical working of the gelatine emulsion process (1880)
Abney, William de Wiveleslie, Sir, 1843-1920, author · London : Piper and Carter · leaf 20
10 THE DAEK EOOM AND ITS FITTINGS. and sloping 45° downwards, by which means any light glancing through the holes strikes the shade and is re¬ flected downwards. A sort of stiff crinoline is made as shown in the figure, … and is covered with paper varnished alternately with aurine varnish and magenta. These varnishes can be combined and applied at once. They are formed by dis¬ solving in shellac varnish small quantities of these dyes, then brushing it over bank-post paper, or even ordinary thin Saxe or Rive paper,…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
