Solution A

Citrate of iron and ammonia......2 1/2 oz.

Water....... . . . 10 oz.

Solution B

Red prussiate of potash......1 1/4 oz

Water..........10 oz.

Solution C

Gum arabic........ . . 1/2 oz.

Water..........2 oz.

Directions

Use equal parts of solutions A and B and add a few drops of solution C. Mix well and apply a thin even coat over the surface of the paper, using a wide, soft brush. This should he done by a very dim light. The coated paper will dry in a few minutes and should then be wrapped up securely so the light cannot get to it until used for printing. The printing is done in the sunlight, and then the paper is washed in clean cold water.

Solutions A and B are sensitive to light and should be kept in colored bottles.