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Sodium thiosulfate - Wikipedia
- https://en.wikipedia.org/wiki/Sodium_thiosulfate#:~:text=It%20is%20used%20for%20both%20film%20and%20photographic,sodium%20thiosulfate%20for%20this%20application.%20Neutralizing%20chlorinated%20water
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HYPOSULPHITE OF SODA. - Grande Arte
- https://www.grandearte.net/american-handbook-daguerrotype/hyposulphite-soda?quicktabs_1=0
- Hyposulphite of Soda.--This salt forms one of the important chemicals for the Daguerreotype operator. Its application to this art is of an interesting nature. It is used to dissolve the sensitive salt of silver which remains unchanged during the exposure in the camera.
39. Hyposulphite Of Soda - stason.org
- https://stason.org/TULARC/recreation/photography/daguerreotype/39-Hyposulphite-Of-Soda.html
- Hyposulphite of Soda.--This salt forms one of the important chemicals for the Daguerreotype operator. Its application to this art is of an interesting nature. It is used to dissolve the sensitive salt of silver which remains unchanged during the exposure in the camera.
Hyposulphite Of Soda - Encyclopedia
- https://theodora.com/encyclopedia/h2/hyposulphite_of_soda.html
- HYPOSULPHITE OF SODA, the name originally given to the substance known in chemistry as sodium thiosulphate, Na 2 S 2 O 3; the earlier name is still commonly used, especially by photographers, who employ this chemical as a fixer. In systematic chemistry, sodium hyposulphite is a salt of hyposulphurous acid, to which Schutzenberger gave the formula H 2 …
Fixation 397 - silver, soda, hyposulphite, bromide, water, fixing and ...
- http://gluedideas.com/content-collection/photography-theory-practice/Fixation-397_P1.html
- The first practical fixer to be used was hypo sulphite of soda, employed for this purpose by Herschel (son of the astronomer) in 1839. Hyposulphite of soda, though it deals effectively with the chloride and bromide of silver, is only a very mediocre fixing agent for photographic coatings containing mainly iodide of silver.
Fixation 397 - hyposulphite, silver, soda, complex, salt, salts and …
- http://gluedideas.com/content-collection/photography-theory-practice/Fixation-397_P2.html
- Acid solutions of hyposulphite of soda, on the other hand, slowly attack metallic silver (A. Lainer, 1890) without the intervention of atmospheric oxygen, the solution of all the silver in a negative sometimes being complete in 48 hours. Leaving negatives or prints for long periods in acid fixing baths is therefore to be avoided.
Hyposulphite of Soda - 1911 Encyclopedia Britannica
- https://www.studylight.org/encyclopedias/eng/bri/h/hyposulphite-of-soda.html
- The name originally given to the substance known in chemistry as sodium thiosulphate, Na 2 S 2 O 3; the earlier name is still commonly used, especially by photographers, who employ this chemical as a fixer. In systematic chemistry, sodium hyposulphite is a salt of hyposulphurous acid, to which Schutzenberger gave the formula H 2 S0 2, but which Bernthsen showed to be H …
Hyposulfite of Soda | Article about Hyposulfite of Soda by …
- https://encyclopedia2.thefreedictionary.com/Hyposulfite+of+Soda
- sodium thiosulfate, Na 2 S 2 O 3, colorless crystalline compound that is more familiar as the pentahydrate, Na 2 S 2 O 3·5H2 O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo.”. Sodium thiosulfate is readily soluble in water and is a mild reducing agent. Because it dissolves silver salts, its major use is in photography for developing film.
Cyanotype - History | Eyes On Photography
- http://www.eyesonphoto.com/2013/03/cyanotype-history.html#!
- Along with the Cyanotype the precursors of the modern day blueprint process and variations such as the chrysotype (gold print) and the platinum process on the basis of the light sensitivity of platinum salts, Herschel managed to fix pictures using hyposulphite of soda in 1839, which is the still used today and better known as ‘hypo’.
John Herschel - Wikipedia
- https://en.wikipedia.org/wiki/John_Herschel
- Herschel discovered sodium thiosulfate to be a solvent of silver halides in 1819, and informed Talbot and Daguerre of his discovery that this "hyposulphite of soda" ("hypo") could be used as a photographic fixer, to "fix" pictures and make them permanent, after experimentally applying it thus in early 1839.
From Fixing Photos to Fixing Cyanide Poisoning: …
- https://pubs.asahq.org/anesthesiology/article/131/5/1124/108732/From-Fixing-Photos-to-Fixing-Cyanide-Poisoning
- In 1819, a soon-to-be-knighted John Herschel (1792 to 1871) discovered that hyposulfite of soda could “fix” or make photographic images permanent by dissolving away unexposed and otherwise insoluble silver salts.
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