—To make a combined toning and fixing bath mix up two solutions, called stock solutions, as follows:
Stock Solution A.
—Dissolve in 20 ounces of cold water 2 ounces of hypo, 1¹⁄₂ ounces of alum in crystals and ¹⁄₂ an ounce of granulated sugar. Then dissolve ¹⁄₂ an ounce of borax in 2 ounces of hot water and mix it with the hypo solution; let it stand over night and then pour off the clear liquid.
Stock Solution B.
—Dissolve ³⁄₄ of a grain of pure chloride of gold and 32 grains of acetate of lead in 4 ounces of water.
Now when you want to tone a picture or half a dozen 4 × 5 prints, take 4 ounces of the stock solution A and ¹⁄₂ an ounce of the stock solution B and pour them into a tray and tone them as I have previously described.
The Simplest Kind of a Camera.
—When you can buy a real camera for two or three dollars it seems of little use to make one, so just consider the camera I shall describe as a scientific curiosity rather than an apparatus of utility.
Fig. 56. an easily made pin-hole camera