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- Daguerreotype - first practical and commercial photographic process, introduced by Louis Daguerre in 1839. The sensitive material comprised silver iodide, deposited on a polished silver plated copper base. A positive image was produced by camera exposure and mercury "development", which turned light struck halides gray-white. The image was made permanent by immersing the plate in a solution of sodium chloride.
- Daylight enlarger - early type of enlarger using light from a hole in a window to provide illumination of the negative.
- Desensitizing - reducing an exposed emulsion's sensitivity to light. This can be done by the application of dyes or by using oxidation agents
- Developer - chemical bath containing reducing agents, which converts exposed silver halides to black metallic silver, making the latent image visible.
- Development - process of converting exposed silver halides to a visible image.
- Diazo - abbreviation of diazonium compounds, which decompose under the action of intense blue or ultraviolet radiation, forming an image in an azo dye.
- Dichroic filters - produced by metallic surface coatings on glass to form colors by interference of light. Used in high quality color enlarger heads.
- Dichroic fog - purple-green bloom usually seen on negatives and caused by the formation of silver in the presence of an acid.
- Dilution - reduction in the strength of a liquid by mixing it with an appropriate quantity of water.
- Dimensional stability - substance's ability to remain unchanging in size when subjected to processing and drying.
- Dish development - method of development used for processing single sheet, cut film or paper by immersing in a shallow dish of developer and agitating by rocking the dish.
- Documentary photography - taking of photographs to provide a record of social and political situations with the aim of conveying information.
- Dodging - control of exposure in photographic printing achieved by reducing exposure to specific areas of the paper.
- Dry down - refers to the amount a print darkens after drying.
- Dry mounting - method of attaching prints to mounting surfaces by heating shellac tissue between the mount and the print.
- Dye destruction process - method of producing a colored image by partially bleaching fully formed dye layers incorporated in the sensitive material.
- Dye-image monochrome films - black & white negative films designed for color processing.
- Dye sensitizing - defined as all silver halides used in black & white emulsions are sensitive to blue light. Early photographic materials possessed only this sensitivity.
- Dye transfer print - method of producing color prints via three color separation negatives. Negatives are used to make positive matrixes, which are dyed in subtractive primaries and printed in register.
- Dynamism - picture structuring which relates to a sense of movement and action.