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To Prepare a Fixing Bath

phite of soda. Cyanide of potassium acts Take water, 6 ounces; hyposulphite of soda, more energetically, but is a very dangerous 1 ounce.

This solution dissolves from the poison, and is not recommended. paper all of the chloride of silver that has not been acted upon by the light, but does not injure the picture or image. The usual time for leaving the print in this bath is about 15 minutes. If the print is held up to transmitted light before it is placed in this solution, it will appear quite opaque and cloudy in what should be the clear parts of the picture.

After the print has been in the bath the proper time this will disappear, and the print have a clear, translucent effect. The print should now be washed in 2 or 3 waters, and 3142. The Photographic Negative or Cliché. In number 3123 we have stated the general principles of the photographic art; that it was based upon the fact that solar light decomposes certain combinations of the salts of silver; that in proportion or to the extent that such sensitive surface is exposed to the action of light, so is the depth of the stain or intensity of the image upon the prepared paper. Now if we should cut from an opaque or black piece of paper, any form or figure-an old fashioned silhouette would be left to soak in a dish of water all night. In a familiar illustration-and place it upon the the morning it can be hung up to dry, and silvered paper, the precise image or form cut then mounted, as the taste of the experiment- in the paper would, upon removal, be found er may suggest. If the saving of time is an upon the paper; the paper remaining white object, the print, after coming from the fixing under the figure leaf or theorem," while the bath, can be rinsed in water and passed parts exposed to the light have turned black. through a common clothes-wringer a few În place of this figure, science has given us times, each time being dipped in clean water, the Photographic Negative or Cliché. when the print will be found to be perfectly negative is an image produced upon glass by washed. When properly fixed, as already a camera (an improved form of the old camdescribed, they are to be washed, and finally era obscura) and derives its name from the mounted on card or bristol board. The best fact that the image is reversed or negative by paste for this purpose is common laundry transmitted light (looking through it), the starch.

A lights appearing dark, and the dark parts