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∙ 15y agoIn the black and white lab, the basic chemicals are:
# Water: water is the basic solvent used for everything. Some workers use distilled water for purity but in most areas tap water is fine. # Developer (alkaline) Makes the latent image on the film or paper visible by reducing the exposed silver halides to metallic silver. # Stop or shortstop (dilute acid) Neutralizes the alkali from the developer to prolong the life of the fixing bath. # Fixer (acid) "Fixes" or makes permanent the image by dissolving remaining undeveloped silver halides in the film or paper to permanently prevent image fogging. (Fixer is often called "hypo" by old timers. This is a misnomer but it leads to the next chemical …) # Hypo Clearing Agent: Dramatically shortens wash times for film or paper by neutralizing residual fixer, mainly by neutralizing acid. If materials are not washed long enough, residual fixer will eventually cause staining. # Wetting agent (detergent) Particularly with film, prevents water spotting by preventing water from "beading" on the surface. Also speeds drying times. Also works well with resin coated (RC) papers to speed drying and prevent water spotting. In most color labs (major exception: Kodachrome), the basic process is essentially the same: The developer still reduces the exposed silver to metallic silver to make the latent image visible, but an added color developer activates color dyes in the emulsion layers. The fixer is sometimes called "blix" because it is a combination of a bleach and fixer. The bleach removes all the silver from the emulsion layers and the image is replaced with dyes. The dyes overlap in the sandwiched emulsion layers to form all the colors. Color processes skip the shortstop and hypo clearing agents. See the Related Link for more details:
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∙ 13y agoSilver Halide. The photographic plate is coated with an emulsion which contains light sensitive silver halide salts. These salts determine the sensitivity, contrast, and resolution of the film.
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∙ 15y agofixer, stop bath and developer are chemicals used in Photography. :] fixer, stop bath and developer are chemicals used in photography. :]
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∙ 13y agotricky question. But typically it would be an emulsion made from silver halide.
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∙ 10y agowhat is the name of the light sensitive compound on a photographic film
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∙ 6y agoSilver compounds with chlorine and bromine are used.
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Why do you store silver chloride in dark coloured room?
TO prevent the siver halides from decomposition...as when it comes in contact of light the photo decomposition takes place.....BY- MOHIT GAUTAM
Is taking a photograph a permanent chemical change?
Modern photography uses chemicals to generate the photographic effect of a camera.
Where do you find photoreactive paper?
Look for light senstive or sun sensitive paper, some also call it solar paper or solar print.
When paper turn yellow brown upon exposure to sun light what type of change is likely taking place?
chemical change
Is paper making wood a physical or chemical change?
making paper from wood is a what change
What is a photographic print made by placing objects on light sensitive paper and exposing it to light?
A photogram
Why is a lens used?
just because it does without the lens light can not concentrates on the photographic sensitive material such as film or photographic paper
What is used to make photographic film?
Photographic film was invented in 1889 by George Eastman. Photographic film and paper is made using silver nitrate which is light sensitive.
How do you make normal paper sensitive to light?
Coat it with a light sensitive emulsion. Don't plan on making your own photographic paper that you will subject to the normal development process. It won't survive the chemistry.
What type of image is produced by a photogram?
A photogram is a photographic image made without a camera by placing objects directly onto the surface of a photo-sensitive material such as photographic paper and then exposing it to light.
What is the meaning of photogram?
Photograms are images created by object shadows, specifically where the objects cast a shadow onto photographic or light-sensitive paper without the use of a camera.
How were photograms invented?
A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. In a darkroom, or a darkened room, objects are arranged on top a piece of photographic material, usually photographic paper. When the operator is satisfied with the arrangement, the photographic material is exposed with light, usually by switching on an enlarger or other artificial light source. The material is then processed, washed and dried. The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed through transparent or semi-transparent objects appear grey.
Why do they use red filters in dark rooms?
Photographic film is not light sensitive to red light ... 2nd Answer: Actually, that is not true. When you are working with photographic film, any light at ALL will 'fog' the film and ruin your photos. Photo paper is nowhere near as sensitive to red light as film is, so you can use a red "safe" light so you can see what you're doing as you print, develop, stop, and fix your photo prints. The room lights may be on as you rinse the print.
What is the purpose of Canon matte photo paper?
Canon matte photo paper is a paper used for photos. The photo paper is paper coated with a light-sensitive chemical formula. The purpose of this paper is to make higher quality pictures.
What photo paper would you use to take photos with a pinhole camera?
You would have to use photographic paper that is sensitive to light.
Who invented paper based film?
George Eastman is credited with inventing paper-based film in the late 1800s. He created flexible, transparent photographic film coated with a light-sensitive emulsion on waterproof paper. This innovation played a significant role in the development of photography as we know it today.
How does traditional photographic paper work?
The light sensitivity of photographic paper--that is, its ability to pick up an image from an image projected onto it from a negative and retain it--seems baffling unless you understand what is happening to the paper on a chemical level. The presence of certain chemicals on photographic paper affect how an image appears, how fast it takes the image to appear on the paper, and even whether the paper will accept a color or black and white image.Chemical CoatingIt is the layer of chemicals coating photographic paper that provides light sensitive properties. Silver halides--or the compound that is created when silver is combined with one of two types of silver fluorides, chloride, silver bromide or iodide--are suspended in gelatin. Depending on the particular mixture used to create the silver halide for a paper emulsion, according to R. E. Jacobsen (et al), author of "The Manual of Photography, the "speed, rates of development and fixation, image colour and tone reproduction qualities" are affected.Light SensitivityThe presence of trace elements, like sulfur for instance, within the gelatin used in the emulsion can affect the light sensitivity, and often increases it. Silver halide crystals present within the emulsion have light-sensitive properties; when they are exposed to light, the surface changes, or develops, and is ready for processing. The crystal actually becomes what is referred to as "developable," or ready for fixing (the actual development process) in a chemical bath that stops the development of the crystals. Were they to develop fully, the image surface would turn completely black. Portions of the chemical coating (emulsion) receiving the most light develop silver halide crystals more densely. Much like film has a speed (ISO 400, for example), photographic paper does also. The paper speed refers to the rate at which the silver halide crystals develop--how light sensitive they are.Monochrome and ColorWhether a paper is intended for monochrome (black and white) images or for color, largely depends on the levels of halide present in the paper's emulsion. The more bromide is present in the paper, the greater the sensitivity of the crystals to longer wavelengths, or those that can pick up color. There are photographic papers made especially for picking up the right black and white tones from color negatives. Photographic paper made for developing prints from black and white images will not process the tones from a color negative correctly, or directly translate the tonality into a grayscale image. Rather, the image will appear murky and out of focus.See the Related Link for more information.
