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Bichromate | Definition of Bichromate by Merriam-Webster
Bichromate definition is - a dichromate especially of sodium or potassium. Recent Examples on the Web The Library of Congress owns another in platinum; the Metropolitan Museum of Art owns a version made in gum bichromate, another labor-intensive process resulting in an image that some liken to red chalk drawings. — Judith H. Dobrzynski, WSJ, 30 Apr. 2021 Mac Cosgrove-Davies prints the same ...
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Bichromate Definition & Meaning | Dictionary.com
Bichromate definition, dichromate. See more. Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 ...
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Bichromate definition and meaning | Collins English Dictionary
Bichromate definition: → dichromate | Meaning, pronunciation, translations and examples
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Gum bichromate - Wikipedia
Gum bichromate is a 19th-century photographic printing process based on the light sensitivity of dichromates. It is capable of rendering painterly images from photographic negatives. Gum printing is traditionally a multi-layered printing process, but satisfactory results may be obtained from a single pass. Any color can be used for gum printing, so natural-color photographs are also possible by using this technique in layers.
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Dichromate | Cr2O7-2 - PubChem
215.99. Date s. Modify. 2021-08-28. Create. 2005-03-27. Dichromate (2-) is a divalent inorganic anion obtained by removal of both protons from dichromic acid. It is a chromium oxoanion and a divalent inorganic anion. It is a conjugate base of a hydrogen dichromate.
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Gum Bichromate : 19 Steps - Instructables
Gum Bichromate: Gun Bichromate is an alternative photography process that creates painterly photographs.
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Gum Bichromate over Platinum with Digital Negatives ...
Immerse yourself in the elegant practice concerning gum bichromate washes applied over platinum / palladium prints. Platinum palladium and gum bichromate are two of the most revered of the alternative processes. The 19th century technique combining these processes has …
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Potassium dichromate - Wikipedia
Potassium dichromate has few major applications, as the sodium salt is dominant industrially. The main use is as a precursor to potassium chrome alum, used in leather tanning. Like other chromium(VI) compounds (chromium trioxide, sodium dichromate), potassium dichromate has been used to prepare "chromic acid" for cleaning glassware and etching materials. Because of safety concerns associated with hexavalent chromium, this practice has been largely discontinued. It is used as an ingredient in cement in which it retards the setting of the mixtu…
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Which is the best definition of bichromate?
Definition of bichromate : a dichromate especially of sodium or potassium : a dichromate especially of sodium or potassium
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What kind of printing process is gum bichromate?
Gum bichromate. Gum bichromate is a 19th-century photographic printing process based on the light sensitivity of dichromates. It is capable of rendering painterly images from photographic negatives. Gum printing is traditionally a multi-layered printing process, but satisfactory results may be obtained from a single pass.
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How is gum bichromate removed from a negative?
The negative is sandwiched between the prepared paper and a sheet of glass in registration with previous passes. The print is then floated face down in a bath of room-temperature water to allow the soluble gum, excess dichromate, and pigment to wash away. Several changes of water bath are necessary to clear the print.
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When did Mungo Ponton invent gum bichromate?
History and process overview. Gum bichromate, or gum dichromate as it is also known, is a photographic printing process invented in the early days of photography when, in 1839, Mungo Ponton discovered that dichromates are light sensitive.
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