Black And White Photography Chemicals


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Black And White Photography Chemicals

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Black And White Photography Chemicals.


Before processing, the film must be removed from the camera and from its cassette, spool or holder in a light-proof room or container.

Chromogenic materials use dye couplers to form colour images. Modern colour negative film is developed with the C-41 process and colour negative print materials with the RA-4 process. These processes are very similar, with differences in the first chemical developer.

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Sheet films can be processed in trays, in hangers (which are used in deep tanks), or rotary processing drums. Each sheet can be developed individually for special requirements. Stand development, long development in dilute developer without agitation, is occasionally used.

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Following the stop bath, the film is bleached to remove the developed negative image. The film then contains a latent positive image formed from unexposed and undeveloped silver halide salts. The film is fogged, either chemically or by exposure to light.

The remaining silver halide salts are developed in the second developer, converting them into a positive image. Finally, the film is fixed, washed, dried and cut.[6] Colour processing[edit]

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In the RA-4 process, the bleach and fix are combined. This is optional, and reduces the number of processing steps.[8]

Alternatively (or as well), the negative may be scanned for digital printing or web viewing after adjustment, retouching, and/or manipulation.

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Photographic processing or development is the chemical means by which photographic film or paper is treated after photographic exposure to produce a negative or positive image. Photographic processing transforms the latent image into a visible image, makes this permanent and renders it insensitive to light.[1]

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† In modern automatic processing machines, the stop bath is replaced by mechanical squeegee or pinching rollers. These treatments remove much of the carried-over alkaline developer, and the acid, when used, neutralizes the alkalinity to reduce the contamination of the fixing bath with the developer.

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Transparency films, except Kodachrome, are developed using the E-6 process, which has the following stages:

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Black and white emulsions both negative and positive, may be further processed. The image silver may be reacted with elements such as selenium or sulphur to increase image permanence and for aesthetic reasons. This process is known as toning.

Black and white negative processing is the chemical means by which photographic film and paper is treated after photographic exposure to produce a negative or positive image. Photographic processing transforms the latent image into a visible image, makes this permanent and renders it insensitive to light.

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The washing time can be reduced and the fixer more completely removed if a hypo clearing agent is used after the fixer.

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If colour negative film is processed in conventional black and white developer, and fixed and then bleached with a bath containing hydrochloric acid and potassium dichromate solution, the resultant film, once exposed to light, can be redeveloped in colour developer to produce an unusual pastel colour effect.[citation needed]

See also[edit] List of photographic processes Fogging Darkroom Cross processing Caffenol References[edit]

In some old processes, the film emulsion was hardened during the process, typically before the bleach. Such a hardening bath often used aldehydes, such as formaldehyde and glutaraldehyde. In modern processing, these hardening steps are unnecessary because the film emulsion is sufficiently hardened to withstand the processing chemicals.

External links[edit] Kodak Processing manuals The Massive Dev Chart – film development times The Comprehensive Development Times Chart – Manufacturer’s film development times database Ilford guide to processing black & white film

Once the film is processed, it is then referred to as a negative.

Key stages in production of Ag-based photographs. Two silver halide particles, one of which is impinged with light (hν) resulting in the formation of a latent image (step 1). The latent image is amplified using photographic developers, converting the silver halide crystal to an opaque particle of silver metal (step 2).

Finally, the remaining silver halide is removed by fixing (step 3).

A black and white developer develops the silver in each image layer. Development is stopped with a rinse or a stop bath. The film is fogged in the reversal step. The fogged silver halides are developed and oxidized developing agents couple with the dye couplers in each layer.

The film is bleached, fixed, stabilised and dried as described above.[7]

Wall, E.J. (1890). Dictionary of Photography. London: Hassel, Watson and Viney Ltd.  The British Journal (1956). Photographic Almanac. London: Henry Greenwood and Co Ltd.

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The negative may now be printed; the negative is placed in an enlarger and projected onto a sheet of photographic paper. Many different techniques can be used during the enlargement process. Two examples of enlargement techniques are dodging and burning.

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All processes based upon the gelatin-silver process are similar, regardless of the film or paper’s manufacturer. Exceptional variations include instant films such as those made by Polaroid and thermally developed films. Kodachrome required Kodak’s proprietary K-14 process. Kodachrome film production ceased in 2009, and K-14 processing is no longer available as of December 30, 2010.[2] Ilfochrome materials use the dye destruction process.

A cut-away illustration of a typical light-trap tank used in small scale developing.

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Hidden categories: All articles with unsourced statementsArticles with unsourced statements from January 2009

The film may be soaked in water to swell the gelatin layer, facilitating the action of the subsequent chemical treatments. The developer converts the latent image to macroscopic particles of metallic silver.

[3] A stop bath,† typically a dilute solution of acetic acid or citric acid, halts the action of the developer. A rinse with clean water may be substituted. The fixer makes the image permanent and light-resistant by dissolving remaining silver halide.

A common fixer is hypo, specifically ammonium thiosulfate.[4] Washing in clean water removes any remaining fixer. Residual fixer can corrode the silver image, leading to discolouration, staining and fading.

[5]

In amateur processing, the film is removed from the camera and wound onto a reel in complete darkness (usually inside a darkroom with the safelight turned off or a lightproof bag with arm holes). The reel holds the film in a spiral shape, with space between each successive loop so the chemicals may flow freely across the film’s surfaces. The reel is placed in a specially designed light-proof tank (called daylight processing tank or a light-trap tank) where it is retained until final washing is complete.

The colour developer develops the silver negative image, and byproducts activate the dye couplers to form the colour dyes in each emulsion layer. A rehalogenising bleach converts the developed silver image into silver halides.

A fixer removes the silver salts. The film is washed, stabilised, dried and cut.[7]

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In commercial processing, the film is removed automatically or by an operator handling the film in a light proof bag from which it is fed into the processing machine. The processing machinery is generally run on a continuous basis with films spliced together in a continuous line. All the processing steps are carried out within a single processing machine with automatically controlled time, temperature and solution replenishment rate. The film or prints emerge washed and dry and ready to be cut by hand. Some modern machines also cut films and prints automatically, sometimes resulting in negatives cut across the middle of the frame where the space between frames is very thin or the frame edge is indistinct, as in an image taken in low light.

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Film may be rinsed in a dilute solution of a non-ionic wetting agent to assist uniform drying, which eliminates drying marks caused by hard water. (In very hard water areas, a pre-rinse in distilled water may be required – otherwise the final rinse wetting agent can cause residual ionic calcium on the film to drop out of solution, causing spotting on the negative.

) Film is then dried in a dust-free environment, cut and placed into protective sleeves.

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All photographic processing use a series of chemical baths. Processing, especially the development stages, requires very close control of temperature, agitation and time.

In selenium toning, the image silver is changed to silver selenide; in sepia toning, the image is converted to silver sulphide. These chemicals are more resistant to atmospheric oxidising agents than silver.

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1 Common processes 1.1 Black and white negative processing 1.2 Black and white reversal processing 1.3 Colour processing 2 Further processing 3 Processing apparatus 3.1 Small scale processing 3.2 Commercial processing 4 See also 5 References 6 External links

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IMAGE COLLECTIONS : Black And White Photography Chemicals

Introduction developing black s at homeThere are many different chemical mixtures that can be used for black white photography you also have chemicals for film and for printsBlack and white photo of boy leaping into the airFilm developers formulas paper developers fixers alternative processes and other technical informationWgiscans217Black and white film remember this stuff growing up in the darkroom i can almost smell the chemicals this is the reason i fell in love with photographyBlack white photo materials films chemicals competitors equivalentsResearch technician mixing chemicals beaker in fore bw stock photoGet your developer and rapid fixer ready i used both ilford xp2 and rapid fixer a changing bag is a must if you prefer to work in a lit room instead of