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English translation: un(der)exposed silver salts/halides
| 21:09 Feb 20, 2017 |
| Spanish to English translations [PRO] Art/Literary - Photography/Imaging (& Graphic Arts) | |||||||
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|  Selected response from: Jennifer Levey Chile Local time: 21:58 | ||||||
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| 4 +1 | un(der)exposed silver salts/halides |
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| 2 +1 | undarkened silver salts |
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Answers
33 mins confidence: 
peer agreement (net): +1
peer agreement (net): +1undarkened silver salts Explanation: I think the work you are looking for is "undarkened". "Many people were thinking about this problem, however. Some chemists had noticed that sunlight cased certain mixtures of silver nitrates to darken. By the early nineteenth century, inventors were trying to combine the camera with these chemical discoveries. The main problems included exposure times as long as eight hours, and how to make photographic images permanent. If light created photographic images, how could they be kept from further darkening once they were finished? This problem was eventually solved by using hyposulfite of soda (now called sodium thiosulfite) to remove the undarkened silver particles." http://www.encyclopedia.com/science/encyclopedias-almanacs-t... BBC Bitesize - GCSE Chemistry - Changing rates - Revision 4 www.bbc.co.uk › Bitesize › GCSE › Science › Chemistry › Chemical reactions and tests Photography. One example of a photochemical reaction is the use of silver halide salts (eg silver chloride) in black and white photography. Silver chloride is .. The Rutherfurd Photographs adsabs.harvard.edu/full/1900PA......8..129H by FE Harpham - 1900 Photography claims the respectable age of twenty decades, though ... a solvent for the salts of silver on the undarkened portion of their plates which would at the .... One of the three legs of the machine has been removed, allowing the frame to ... -------------------------------------------------- Note added at 35 mins (2017-02-20 21:44:31 GMT) -------------------------------------------------- Word not work in my first sentence. |
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2 hrs confidence: peer agreement (net): +1
peer agreement (net): +1un(der)exposed silver salts/halides Explanation: It refers to the areas of the film emulsion, which contains silver halides (salts), that have not been exposed to light light intensities sufficient to cause chemical de/re-composition. Thinking laterally (Edward de Bono et al.) "sunburn" leads to a darkening (reddening) of the human skin (if not something worse...). |
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Reference comments
21 mins |
| Reference Reference information: If finely spread this silver will show up as a dark patch. If no light falls onto the silver bromide it will not decompose. In photography, the undecomposed silver halide is removed by reacting it with a sodium thiosulfate solution to dissolve the unreacted silver halide and so stop further blackening of the paper. http://www.taylorscience.com.au/chem11/Chemistry_11/Chemistr... Undecomposed or not blackened? -------------------------------------------------- Note added at 27 mins (2017-02-20 21:36:12 GMT) -------------------------------------------------- Photography remains an application, although this has been largely superseded by digital photography. Silver halides are sensitive to light, which causes them to decompose and form minute nuclei of silver metal, which are grown using an appropriate reductant. The undecomposed halogenide is then removed by means of a fixing agent. http://www.umicore.com/en/about/elements/silver/ |
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