A Popular Treatise On Photography
A Popular Treatise On Photography
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In our eReader you can find the full English version of the book. Read A Popular Treatise On Photography Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Popular Treatise On Photography
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PRINTING POSITIVE PROOFS.
THEORETICALLY, the printing process is one of the greatest simplicity : One side of a sheet of paper is first imhued with a solution of common salt, and dried ; it is then treated with a solution of nitrate of silver. A white substance, called chloride of silver, is formed in the texture of the paper, which has the singular property of becoming rapidly darkened on exposure to the sun ; it is on this account that when it is prepared the operation should be performed in ...the absence of daylight, and the sensitive paper preserved in a dark box.
It is evident that if paper so prepared be placed behind a negative, and exposed to daylight, a positive image will be produced on the paper. And, in order to its preserva- tion, it will be necessary to remove the whole of the chloride of silver unacted on by light, without affecting those por- tions which constitute the image ; this is readily accom- plished by soaking the proof for a quarter of an hour in a solution of hyposulphite of soda, and then washing most copiously in water to remove every trace of this fixing agent from the texture of the paper.
What to read after A Popular Treatise On Photography?
You can find similar books in the "Read Also" column, or choose other free books by D Van Dsir Van Monckhoven to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
PRINTING POSITIVE PROOFS.
THEORETICALLY, the printing process is one of the greatest simplicity : One side of a sheet of paper is first imhued with a solution of common salt, and dried ; it is then treated with a solution of nitrate of silver. A white substance, called chloride of silver, is formed in the texture of the paper, which has the singular property of becoming rapidly darkened on exposure to the sun ; it is on this account that when it is prepared the operation should be performed in ...the absence of daylight, and the sensitive paper preserved in a dark box.
It is evident that if paper so prepared be placed behind a negative, and exposed to daylight, a positive image will be produced on the paper. And, in order to its preserva- tion, it will be necessary to remove the whole of the chloride of silver unacted on by light, without affecting those por- tions which constitute the image ; this is readily accom- plished by soaking the proof for a quarter of an hour in a solution of hyposulphite of soda, and then washing most copiously in water to remove every trace of this fixing agent from the texture of the paper.
What to read after A Popular Treatise On Photography?
You can find similar books in the "Read Also" column, or choose other free books by D Van Dsir Van Monckhoven to read onlineMoreLess
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