Summary

Various,  Notes and Queries, Number 168, January 15…

“ Having occasion to remove a slate from the side of my roof, to make an opening for my camera, I thought of a sheet of India rubber to supply the place of the slate, and thus obtain a flexible waterproof covering to exclude the wet, and to open and shut at pleasure. This succeeded admirably, but I found that I had also obtained a deep rich yellow window, which perfectly lighted a large closet, previously quite dark, and in which for the last ten days I have excited and developed the most sensitive iodized collodion on glass. ”
Source: Gutenberg

Various,  Notes and Queries, Number 168, January 15…

“ F. W. If the bath of nitrate of silver produces the semi-opaque appearance upon the collodion, in all probability there is no hyposulphite of soda in the bath: three or four drops of tincture of iodine added to each ounce of the solution of nitrate of silver in the bath, often acts very beneficially. All doubtful solutions of nitrate of silver it is well to precipitate by means of common salt, collect the chloride, and reduce it again to its metallic state. ”
Source: Gutenberg

Various,  Notes and Queries, Number 168, January 15…

“ By using the glass a little larger than is required, as has been before recommended, and pouring the hyposulphite of soda on the portion which is to be cut off, and allowing it to flow over the picture, the defect will generally be avoided. A much stronger solution of the hyposulphite of soda may be used—say, one ounce to two ounces of water; and then, by preserving the solution, and using it over and over again, a more agreeable picture is produced. The solution, when it becomes weak, may be refreshed by a few crystals of the fresh salt added to it. ”
Source: Gutenberg

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