THE FIXING LIQUID.
| Cyanide of Potassium | 2 | to 12 to 20 grains |
| Water | 1 | fluid ounce. |
| or, Hyposulphite of Soda | ½ | ounce. |
| Water | 1 | fluid ounce. |
For remarks on the Cyanide of Potassium Fixing Bath, see the last Section, [page 207].
[CHAPTER III.]
MANIPULATIONS OF THE COLLODION PROCESS.
These may be classed under five heads:—Cleaning the Plates.—Coating with Iodide of Silver.—Exposure in the Camera.—Developing the image.—Fixing the image.—In addition to this, the present Chapter will include in separate Sections directions for the choice and management of lenses, for copying engravings, manuscripts, etc., and for taking stereoscopic and microscopic photographs.
CLEANING THE GLASS PLATES.
Care should be taken in selecting glass for use in Photography. The ordinary window-glass is inferior, having scratches upon the surface, each of which may cause an irregular action of the developing fluid; and the squares are seldom flat, so that they are apt to be broken in compression during the printing process.