Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Chromatype Paper
Simple mass of a gray color; after washing, this may Soak the paper in the simple solution (see No. be dissolved in nitric acid and crystallized. 3182), and dry it at a brisk fire. To fix the Another process is to mix the chloride with drawing, careful immersion in warm water is nitrate of potassa and fuse in a crucible-the all that is required. It is not sufficiently silver is thus obtained in a button. The sensitive for the camera.
PAPER. papers must be incinerated, the ashes collected and treated with nitric acid and heat; diluted with water, and filtered; it is now an impure solution of silver, to be treated in For COMPOUND CHROMATYPE PAPER.
Wash the paper with the compound solution (see No. 3182), and dry it. After the paper has been exposed to the sun with the article the same way as the bath. (See No. 3158.) to be copied superposed upon it, it is washed 3167. To Clean off Collodion Pictures. A tuft of cotton dipped in methylic alcohol, and rubbed over the surface of the picture, will remove it entirely, whether varnished or not.