The photographic colourist : a manual for the use of amateurs : giving every particular required for painting lantern slides and other transparencies, colouring diagrams, preparing lantern slides without the aid of photography, blacking out backgrounds, scratching in details, tinting paper prints, colouring paper prints to imitate oil paintings, crystoleum painting, etc., etc. (1900)
Neville, J. W., author · London : Iliffe & Sons Limited · leaf 32
HIC COLOURIST. piece of white paper is placed beneath them. In this way much valuable time is lost — time that could be better utilised if some method was adopted to render this unneces- sary. It is with this object in view that the painting table has been invented ; and in use will be found a… … looking-glass is placed at an angle of 450. When this box or painting table is opposite a window, the looking-glass receives the light and reflects it through the picture
Lantern slides · Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.