A complete treatise on the art of retouching photographic negatives : and clear directions how to finish & colour photographs (1898)
Johnson, Robert · London : Marion · leaf 215
i8i AD VER TISEMENTS MARION'S MOUNTING SOLUTION FOR PHOTOGRAPHS. … DIRECTIONS FOR USE. Place the bottle in warm water, or on a stove, till the Solution is melted. Apply it with a stiff brush (which must be perfectly dry) to the back of the Photograph. Let the Photograph thus coated remain for a few seconds, and then place it on the Mount, and press it well down.…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
