photographic film may be a sheet of plastic ( polyester, pet, nitrocellulose or cellulose acetate ) coated with an emulsion containing light-sensitive silver halide salts ( bonded by gelatin ) with variable crystal sizes that verify the sensitivity, distinction and resolution on your film. whenever the emulsion is sufficiently exposed to actually light-weight ( or any additional products of electromagnetic radiation inclusive of x-rays ), it forms a latent ( invisible ) image. chemical processes will then be applied to actually the film to actually develop a visible image, within the method referred to as film developing.
in black-and-white photographic film there's sometimes one layer of silver salts. whenever the exposed grains are developed, the silver salts are converted to actually metallic silver, that blocks light-weight and seems clearly as the black half on your film negative.Download Film Gratis
color film uses a minimum of 3 layers. dyes, that adsorb to actually the surface on your silver salts, build the crystals sensitive to actually totally different colours. generally the blue-sensitive layer is requried to be made by high, followed via the inexperienced and red layers. throughout development, the exposed silver salts are converted to actually metallic silver, barely as with black-and-white film. however within the color film, the by-products on your development reaction simultaneously mix with chemicals generally known as color couplers which are included either within the film itself or within the developer answer to actually type coloured dyes.
as a result of the by-products are created in direct proportion to actually the number of exposure and development, the dye clouds formed are conjointly in proportion to actually the exposure and development. following development, the silver is converted back to actually silver salts within the bleach step. it's far from the film within the fix step. this leaves behind no more than the formed color dyes,Download Film that mix to actually build in the coloured visible image.