Play Video
1
Amidol Darkroom Photographic Print  Developer, Part II
Amidol Darkroom Photographic Print Developer, Part II
::2011/02/12::
Play Video
2
Amidol Photographic Black and White Developer Formula, Pt. 1
Amidol Photographic Black and White Developer Formula, Pt. 1
::2011/02/06::
Play Video
3
Tintype Photograph in developer
Tintype Photograph in developer
::2011/10/09::
Play Video
4
developing photographic paper in coffee+vitiminC+washingsoda demo
developing photographic paper in coffee+vitiminC+washingsoda demo
::2011/05/21::
Play Video
5
How to  Make a Print in Photography : Developer Types & Times for Photography Prints
How to Make a Print in Photography : Developer Types & Times for Photography Prints
::2008/09/11::
Play Video
6
Darkroom Photography Techniques : How to Develop 35MM Film
Darkroom Photography Techniques : How to Develop 35MM Film
::2009/07/14::
Play Video
7
How to Pronounce Pyrogallic Acid
How to Pronounce Pyrogallic Acid
::2014/08/15::
Play Video
8
Minolta Minoltafax-4500 Photographic Copying Machine Autopsy Pt1
Minolta Minoltafax-4500 Photographic Copying Machine Autopsy Pt1
::2011/08/25::
Play Video
9
How to Pronounce Hydro-quinone
How to Pronounce Hydro-quinone
::2014/08/20::
Play Video
10
How to Make Your Own Positive Photo Resist Developer
How to Make Your Own Positive Photo Resist Developer
::2013/11/03::
Play Video
11
How to Pronounce Restrainers
How to Pronounce Restrainers
::2014/06/19::
Play Video
12
Where Black and White Film is Made - Ilford Photo Factory Tour 18-11-2013
Where Black and White Film is Made - Ilford Photo Factory Tour 18-11-2013
::2013/12/15::
Play Video
13
The Studio Q Show - S01E05 - WWPD and Developer
The Studio Q Show - S01E05 - WWPD and Developer
::2014/05/06::
Play Video
14
Mixing Ferrous Sulfate Developer for Wetplate Collodion Photography
Mixing Ferrous Sulfate Developer for Wetplate Collodion Photography
::2013/09/04::
Play Video
15
How to Pronounce Hydro-quinol
How to Pronounce Hydro-quinol
::2014/08/26::
Play Video
16
How to Add Photographic Images to Components Using Waterslide Image Transfers
How to Add Photographic Images to Components Using Waterslide Image Transfers
::2014/05/02::
Play Video
17
How to Add Photographic Images to Apoxie® Sculpt Using Waterslide Image Transfers
How to Add Photographic Images to Apoxie® Sculpt Using Waterslide Image Transfers
::2014/05/02::
Play Video
18
how to mine silver from your old photos
how to mine silver from your old photos
::2013/01/01::
Play Video
19
How to Pronounce Soup Up
How to Pronounce Soup Up
::2014/08/15::
Play Video
20
Photographic Journey Apple iPad app TV Ad (HD)
Photographic Journey Apple iPad app TV Ad (HD)
::2011/10/28::
Play Video
21
Film Developing: Advanced Paper & Chemicals : Film Developing: T-MAX Paper Developer
Film Developing: Advanced Paper & Chemicals : Film Developing: T-MAX Paper Developer
::2008/09/06::
Play Video
22
Photography Tips & Tricks Bonus Episode: Product Snapshot Macphun
Photography Tips & Tricks Bonus Episode: Product Snapshot Macphun's Intensify Pro
::2014/06/11::
Play Video
23
How to Pronounce Amino-phenol
How to Pronounce Amino-phenol
::2014/08/10::
Play Video
24
Film Episode 8: "Richard Photo Lab"
Film Episode 8: "Richard Photo Lab"
::2012/06/29::
Play Video
25
LundPhotographics, Mixing Ferrous Sulfate Developer
LundPhotographics, Mixing Ferrous Sulfate Developer
::2013/09/28::
Play Video
26
Film Developing: Advanced Paper & Chemicals : Film Developing: Agfa Developer & Paper
Film Developing: Advanced Paper & Chemicals : Film Developing: Agfa Developer & Paper
::2008/09/06::
Play Video
27
Developer - In Pure Form 03
Developer - In Pure Form 03
::2014/07/28::
Play Video
28
How to Mix Black and White D-76 Film Developer from Powdered Concentrate
How to Mix Black and White D-76 Film Developer from Powdered Concentrate
::2012/09/17::
Play Video
29
Film Chemistry: "The Alchemist In Hollywood" ASC 1940
Film Chemistry: "The Alchemist In Hollywood" ASC 1940
::2011/12/28::
Play Video
30
How to Pronounce Pyro Gallic Acid
How to Pronounce Pyro Gallic Acid
::2014/08/13::
Play Video
31
Durst Lambda Dismantle Timelapse
Durst Lambda Dismantle Timelapse
::2012/03/31::
Play Video
32
Regenerated Wembley - a Photographic Tour
Regenerated Wembley - a Photographic Tour
::2012/11/03::
Play Video
33
How-To: Develop Film with Coffee and Vitamin C (Caffenol)
How-To: Develop Film with Coffee and Vitamin C (Caffenol)
::2011/06/30::
Play Video
34
DIY Rodinal Film Developer
DIY Rodinal Film Developer
::2014/01/08::
Play Video
35
Stigma - A Photographic Journey with Aeron Photography
Stigma - A Photographic Journey with Aeron Photography
::2011/11/01::
Play Video
36
B&W Darkroom: X-Ray Film Processing
B&W Darkroom: X-Ray Film Processing
::2012/08/28::
Play Video
37
Stuart J
Stuart J's Lens: David Quisenberry Photography - McKinney.mov
::2012/06/24::
Play Video
38
Photographic Tutorial # 6 - High Dynamic Range(HDR) How To Shoot/Edit/Export With HDR EFEX PRO.
Photographic Tutorial # 6 - High Dynamic Range(HDR) How To Shoot/Edit/Export With HDR EFEX PRO.
::2011/06/29::
Play Video
39
PHA 10th National Photography Competition 3 - 9 May 2010 Lahore, Pakistan
PHA 10th National Photography Competition 3 - 9 May 2010 Lahore, Pakistan
::2010/05/04::
Play Video
40
Photo Emulsion Method
Photo Emulsion Method
::2011/07/05::
Play Video
41
How to Develop Black and White Film
How to Develop Black and White Film
::2012/09/03::
Play Video
42
Behind the Triangle Wars - Capturing the spirit of St Kilda
Behind the Triangle Wars - Capturing the spirit of St Kilda
::2011/09/27::
Play Video
43
WEB DEVELOPER   BACKGROUND
WEB DEVELOPER BACKGROUND
::2014/02/20::
Play Video
44
ABC Pyro Black and White Developer Part II
ABC Pyro Black and White Developer Part II
::2011/03/18::
Play Video
45
Patients Unloaded From R5D; USCG Photo Laboratory, Guam, 1945 (full)
Patients Unloaded From R5D; USCG Photo Laboratory, Guam, 1945 (full)
::2014/08/19::
Play Video
46
Photography Technique: The Invisible Black Background
Photography Technique: The Invisible Black Background
::2013/05/20::
Play Video
47
Using collapsible accordion bottles in the darkroom
Using collapsible accordion bottles in the darkroom
::2012/03/12::
Play Video
48
Photography, Expanded: The Story of Data - Visualization, Mapping, and Photography
Photography, Expanded: The Story of Data - Visualization, Mapping, and Photography
::2014/05/14::
Play Video
49
Built-in Ice Cream Sandwich Developer Tools
Built-in Ice Cream Sandwich Developer Tools
::2011/11/22::
Play Video
50
Ilford HP5 Plus and Rodinal - Experimental Developing for Minimum Grain and Good Contrast.
Ilford HP5 Plus and Rodinal - Experimental Developing for Minimum Grain and Good Contrast.
::2013/06/28::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
Jump to: navigation, search

In the processing of photographic films, plates or papers, the photographic developer (or just developer) is one or more chemicals that convert the latent image to a visible image. Developing agents achieve this conversion by reducing the silver halides, which are pale-colored, into silver metal, which is black (when a fine particle).[1] The conversion occurs within the gelatine matrix. The special feature of photography is that the developer only acts on those particles of silver halides that have been exposed to light. Generally, the longer a developer is allowed to work, the darker the image.

Chemical composition of developers[edit]

For black-and-white photography, the developer typically consists of a mixture of chemical compounds prepared as an aqueous solution. Three main components of this mixture are:[2]

Hydroquinone is superadditive with metol, meaning that it acts to "recharge" the metol after it has been oxidised in the process of reducing silver in the emulsion. Sulfite in a developer not only acts to prevent aerial oxidation of the developing agents in solution, it also facilitates the regeneration of metol by hydroquinone (reducing compensation and adjacency effects) and in high enough concentrations acts as a silver halide solvent. The original lithographic developer contained formaldehyde (often added as paraformaldehyde powder) in a low sulfite/bisulfite solution.

Most developers also contain small amounts of potassium bromide to modify and restrain the action of the developer[3] to suppress chemical fogging. Developers for high contrast work have higher concentrations of hydroquinone and lower concentrations of metol and tend to use strong alkalis such as sodium hydroxide to push the pH up to around pH 11 to 12.

Metol is difficult to dissolve in solutions of high salt content and instructions for mixing developer formulae therefore almost always list metol first. It is important to dissolve chemicals in the order in which they are listed. Some photographers add a pinch of sodium sulfite before dissolving the metol to prevent oxidation, but large amounts of sulfite in solution will make it very slow for metol to dissolve.

Because metol is relatively toxic and can cause skin sensitisation, modern commercial developers often use phenidone or dimezone S (4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone) instead. Hydroquinone can also be toxic to the human operator as well as environment; some modern developers replace it with ascorbic acid, or vitamin C. This, however, suffers from poor stability. Ascorbate developers may have the advantage of being compensating and sharpness-enhancing, as oxidation by-products formed during development are acidic, meaning they retard development in and adjacent to areas of high activity. This also explains why ascorbate developers have poor keeping properties, as oxidised ascorbate is both ineffective as a developing agent and lowers the pH of the solution, making the remaining developing agents less active. Recently, claims for practical methods to improve the stability of ascorbate developers have been made by several experimenters.[citation needed]

Other developing agents in use are p-aminophenol, glycin (N-(4-hydroxyphenyl)glycine), pyrogallol, and catechol. When used in low sulfite developer composition, the latter two compounds cause gelatin to harden and stain in the vicinity of developing grains. Generally, the optical density of the stain increases in the heavily exposed (and heavily developed) area. This is a property that is highly sought after by some photographers because it increases negative contrast in relation to density, meaning that highlight detail can be captured without "blocking" (reaching high enough density that detail and tonality are severely compromised). Hydroquinone shares this property. However, the staining effect only appears in solutions with very little sulfite, and most hydroquinone developers contain substantial quantities of sulfite.[citation needed]

In the early days of photography, a wide range of developing agents were used, including chlorohydroquinone, ferrous oxalate,[4] hydroxylamine, ferrous lactate, ferrous citrate, Eikonogen, atchecin, antipyrin, acetanilid and Amidol (which unusually required mildly acidic conditions).

Developers also contain water softening agent to prevent calcium scum formation (e.g., EDTA salts, sodium tripolyphosphate, NTA salts, etc.).

The original lithographic developer was based upon a low sulfite/bisulfite developer with formaldehyde(added as the powder paraformaldehyde). The very low sulfite, high hydroquinone and high alkalinity encouraged "infectious development"(exposed developing silver halide crystals collided with unexposed silver halide crystals, causing them to also reduce) which enhanced the edge effect in line images. These high energy developers had a short tray life, but when used within their tray life provided consistent usable results.

Modern lithographic developers contain hydrazine compounds, tetrazolium compounds and other amine contrast boosters to increase contrast without relying on the classic hydroquinone-only lithographic developer formulation. The modern formulae are very similar to rapid access developers (except for those additives) and therefore they enjoy long tray life. However, classic lithographic developers using hydroquinone alone suffers very poor tray life and inconsistent results.

Development[edit]

The developer selectively reduces silver halide crystals in the emulsion to metallic silver, but only those having latent image centres created by action of light.[5] The light sensitive layer or emulsion consists of silver halide crystals in a gelatin base. Two photons of light must be absorbed by one silver halide crystal to form a stable two atom silver metal crystal. The developer used generally will only reduce silver halide crystals that have an existing silver crystal. Faster exposure or lower light level films usually have larger grains because those images capture less light. Fine grain films, like Kodachrome, require more light to increase the chance that the halide crystal will absorb at least two quanta of light as they have a smaller cross sectional size. Therefore silver halide crystal size is proportional to film speed. The metallic silver image has dark (black) appearance. Once the desired level of reduction is achieved the development process is halted by washing in a dilute acid and then the undeveloped silver halide is removed by dissolving it in a thiosulfate solution, a process called fixing. Most commercial film developers use a dual solution or "push" (pushes the films speed) development (compensating developer, like Diafine) procedure where the reducing agent e.g. hydroquinone solution soaks into and swells the gelatin then the film is introduced into the alkaline solution which activates (lowers reduction potential) of the developer. The areas with the most light exposure use up the tiny amount of developer in the gelatin and stop making silver crystal before the film at that point is totally opaque. The areas that received the least light continue to develop because they haven't used up their developer. There is less contrast, but time is not critical and films from several customers and different exposures will develop satisfactorily.

The time over which development takes place, and the type of developer, affect the relationship between the density of silver in the developed image and the quantity of light. This study is called sensitometry and was pioneered by F Hurter & V C Driffield in the late 19th century.[6]

Colour development[edit]

In colour and chromogenic black-and-white photography, a similar development process is used except that the reduction of silver simultaneously oxidizes the paraphenylene colour developing agent which then takes part in the production of dye-stuffs in the emulsion by reacting with the appropriate couplers. There are three distinct processes used here. The C-41 process is used for almost all colour negative films and in this process dye couplers in the emulsion react with the oxidized colour developing agent in the developer solution to generate the visible dyes. An almost identical process is then used to produce colour prints from films. The developing agents used are derivates of paraphenylene diamine.

In colour negative films,[7] there are 3 types of dye couplers. There are the normal cyan, magenta and yellow dye forming couplers, but also there is a magenta coloured cyan masking coupler and a yellow coloured magenta masking coupler. These form respectively normal cyan dye, and magenta dye, but form an orange positive mask to correct colour. In addition, there is a third type of coupler called a DIR (Developer Inhibitor Release) coupler. This coupler releases a powerful inhibitor during dye formation, which affects edge effects and causes effects between layers to enhance overall image quality.

Reversal film development[edit]

In Ektachrome-type (E-6 process)[8] transparencies, the film is first processed in an unusual developer containing phenidone and Hydroquinone-monosulfonate. This black and white developer is used for 6:00 at 100.4°F (38°C), with more time yielding "push" processing to increase the apparent film speed by reducing the Dmax, or maximum density. The first developer is the most critical step in Process E-6. The solution is essentially a black-and-white film developer, because it forms only a negative silver image in each layer of the film; no dye images are yet formed. Then, the film goes directly into the first wash for 2:00 at 100 °F, which acts as a controlled stop bath. Next, the film goes into the reversal bath. This step prepares the film for the colour developer step. In this reversal bath, a chemical reversal agent is absorbed into the emulsion, with no chemical reaction taking place until the film enters the colour developer. The reversal process can also be carried out using 800 footcandle-seconds of light, which is used by process engineers to troubleshoot reversal bath chemistry problems.

Next, the film is developed to completion in the colour developer bath, which contains CD-3 as the colour developing agent. When film enters the colour developer, the reversal agent absorbed by the emulsion in the reversal bath chemically fogs (or "exposes") the unexposed silver halide (if it has not already been fogged by light in the previous step). The colour developer acts on the chemically exposed silver halide to form a positive silver image. However, the metallic silver image formed in the first developer, which is a negative image, is not a part of the reaction that takes place in this step. What is being reacted in this stage is the "leftover" of the negative image, that is, a positive image. As the colour development progresses, metallic silver image is formed, but more importantly, the colour developing agent is oxidised. Oxidised colour developer molecules react with the couplers to form colour dyes in situ. Thus colour dye is formed at the site of development in each of the three layers of the film. Each layer of the film contains different couplers, which react with the same oxidised developer molecules but form different colour dyes. Next, the film goes into the pre-bleach (formerly conditioner) bath, which has a precursor of formaldehyde (as a dye preservative) and EDTA to "kick off" the bleach. Next, the film goes into a bleach solution. The bleach converts metallic silver into silver bromide, which is converted to soluble silver compounds in the fixer. During bleaching, iron (III) EDTA is changed to iron (II) EDTA (Fe+++ EDTA + Ag° + Br−→ Fe++ EDTA + AgBr) before fixing, and final wash. The most common processing chemistry for such films is E6, derived from a long line of developers produced for the Ektachrome range of films.

Ektachrome papers are also available.

Standard black and white stock can also be reversal processed to give black and white slides.[9] After 'first development,' the initial silver image is then removed (e.g. using a potassium bichromate/sulfuric acid bleach, which requires a subsequent "clearing bath" to remove the chromate stain from the film). The unfixed film is then fogged (physically or chemically) and 'second-developed'. . However the process works best with slow films such as Ilford Pan-F processed to give a high gamma. Kodak's chemistry kit for reversing Panatomic-X ("Direct Positive Film Developing Outfit") used sodium bisulfate in place of sulfuric acid in the bleach, and used a fogging developer that was inherently unstable, and had to be mixed and used within a two hour period. (If two rolls, the maximum capacity of a single pint of redeveloper, were to be processed in succession, the redeveloper had to be mixed while the first roll was in the first developer.)

Proprietary methods[edit]

The K-14 process for Kodachrome films involves adding all the dyes to the emulsion during development.

In colour print development, the Cibachrome process also uses a print material with the dye-stuffs present and which are bleached out in appropriate places during developing. The chemistry involved here is wholly different from C41 chemistry; (it uses azo-dyes which are much more resistant to fading in sunlight).

References[edit]

  1. ^ Karlheinz Keller et al. "Photography" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi: 10.1002/14356007.a20_001
  2. ^ Dictionary of Photography, 1890, p115
  3. ^ Dictionary of Photography, 1890, p218 -219
  4. ^ Dictionary of Photography, 1890, p131
  5. ^ Woodworth, Chuck. "How Film Works". BYG Publishing. Retrieved 14 March 2013. 
  6. ^ Papagiannakis, E. E. Krieziz, D. P. Chrissoulidis & A. G. (1992). Electromagnetics and optics. River Edge, N.J.: World Scientific. p. 397. ISBN 9810208499. 
  7. ^ Photographic Almanac, 1956, p. 429–423
  8. ^ "KODAK PROFESSIONAL Chemicals, Process E-6". Kodak. Retrieved 14 March 2013. 
  9. ^ Advanced Photography, 1980,p. 345
  • 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. 
  • Langford, M J (1980). Advanced Photography. London: Focal Press. 
Wikipedia content is licensed under the GFDL License
Powered by YouTube
LEGAL
  • Mashpedia © 2014