Lantern slides : how to make and color them (1895)
Elmendorf, Dwight L. (Dwight Lathrop), 1859-1929 · New York : E. & H.T. Anthony & Co. · leaf 77
63 Requisites. i. A nest of white porcelain saucers should be obtained, such as microscopists use. They are invaluable for slide work, as each saucer forms a cover for the other, so that all dust is excluded. … 2. Each color should have a brush of its own, which should never be used for any other. The author uses three each for the majority of colors, Nos. 2, 3, and 4, soft round camel’s hair.
Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.