This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865 Excerpt: ...of potassium in solution is not to be recommended as a fixing agent, because it soon penetrates the collodion film, and then seems to disorganize the stratum of albumen or gelatine beneath it, and to produce bubbles and other irregularities in the film that deteriorate the picture. But if the tannin picture is somewhat ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865 Excerpt: ...of potassium in solution is not to be recommended as a fixing agent, because it soon penetrates the collodion film, and then seems to disorganize the stratum of albumen or gelatine beneath it, and to produce bubbles and other irregularities in the film that deteriorate the picture. But if the tannin picture is somewhat fogged, it may be clarified in a great measure, and rendered tolerably passable, in the following manner, in which cyanide of potassium is brought into play: CLARIFYING A TANNIN NEGATIVE. Make the following solutions: TINCTURE OF IODINE. j f Iodine 30 grains. 1 Alcohol.... 1 ounce.. CYANIDE OF POTASSIUM SOLUTION. No 2-f vane f potassium... 1 drachm. (Eain-water... 4 ounces. If the film is but slightly fogged, flow it with 4 drachms of water containing 20 minims of tincture of iodine for a short time. This dilute solution of iodine may be used several times in succession, until its color has almost entirely vanished. Wash the film, and flow over it a sufficient quantity of the solution of cyanide of potassium. This is very rapid in its action on the iodide of silver, and soon clarifies the negative. With cautious manipulation, such an expedient may be resorted to with advantage; but in general it produces harsh negatives in which the finest markings have been destroyed, and nothing but lights and shades remain in stern contrast, without all intermediate gradation to give harmony to the subject. A stronger solution of the tincture of iodine is necessary to remove stains from the corners of negatives; even that in the undiluted form of No. 1 will not be too strong. Care, however, rmist be taken that it does not flow any further upon the negative than is requisite by the extent of the stain; the place is then washed and treated with the cyanide s...
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Add this copy of Dry Plate Photography; Or, the Tannin Process, Made to cart. $16.98, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2022 by LEGARE STREET PR.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Add this copy of Dry Plate Photography; or, The Tannin Process, Made to cart. $22.70, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of Dry Plate Photography; Or, the Tannin Process, Made to cart. $30.90, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2022 by LEGARE STREET PR.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Add this copy of Dry Plate Photography; Or, the Tannin Process, Made to cart. $32.50, new condition, Sold by Paperbackshop International rated 2.0 out of 5 stars, ships from Fairford, GLOS, UNITED KINGDOM, published 2022 by LEGARE STREET PR.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Add this copy of Dry Plate Photography; or, The Tannin Process, Made to cart. $34.72, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
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