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The larger the silver halide crystals are, the higher the films speed rating will be. The film will also be easier to overexpose.
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When photographic film is exposed to light the salt on the film breaks down what metal is formed?
The "salt" you are referring to is actually called silver-halide and are more commonly known as "silver salts". When silver-halide crystals are exposed to light, they form a compound known as "metallic silver"
What is the active layer in film called?
an emulsion of small particles of a photosensitive silver salt (Usually silver halide) suspended in gelatin
The film speed rating for black and white film is determined by A the size of the silver halide crystals in the emulation B the shutter speeds of the camera C the film base?
Are we doing your homework? It's A), and it's emulsion, not emulation
The term used to describe silver and bromide atoms that combine to form the crystals in our film emulsion is?
substance
When photographic film is exposed to light the salt on the film breaks down. what metal is formed?
The "salt" you are referring to is actually called silver-halide and are more commonly known as "silver salts". When silver-halide crystals are exposed to light, they form a compound known as "metallic silver"
What compounds of elements are used to make photographic film and paper?
Usually, either polyester or acetate substrates, coated with emulsion on the image side. In black and white film, the emulsion is a gelatinous substance containing silver halide grains that are sensitive to light. Color film emulsion contains silver halide in 3 layers with separation layers in between. The separation layers are designed to "channel" light to the proper layer, based on the color of the light. The sum of all the layers is thinner than a human hair! During development of color film, the silver is converted, then replaced with dye.
Why is silver nitrate added to halide salts?
To form an insoluble silver halide.
What is the relationship between film screen speed and radiographic detail?
Film speed is related to the size of the silver halide crystals in the emulsion or to the thickness of the silver halide layer. X-rays are more likely to interact with a large crystal or the increased number of crystals in a thicker layer. Fast films (high speed) have larger crystals or thicker layers. Slow films have smaller crystals or thinner layers. The image detail is inversely related to the speed; that is, detail is greater with slow films because the area exposed by each x-ray is smaller (less amplification conferred by each x-ray). In other words, information from the patient (in the form of an x-ray) will be deposited over a smaller area with slow film, so detail will be better. However, more radiation will be necessary because the probability of an x-ray leaving the patient and hitting the crysal will be less with small crystals than with large ones. Hope this helps :-)
What is the active ingredient in a light sensitive emulsion that records the latent image and is later converted to a permanent visible image during developing?
A silver halide--a compound consisting of a silver atom bonded to either an iodine atom or a chlorine atom.
What is an autochrome?
An autochrome is an early form of photograph produced by means of a glass plate coated on one side with a random mosaic of microscopic dyed grains of potato starch under silver halide emulsion.
What effect does silver nitrate solution have upon each of the halide salt solutions?
The product is a silver halide insoluble in water.
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.
