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Photo Chemical Glossary

right reading
    An obsolete phototool definition of image orientation in which the

film sandwich
    A sandwich composed of photomasks made with flexible film materials.

    A ridge or groove in flat-rolled metal caused by improper tension control during

reversal development
    A process used with certain photographic emulsions for reversing

    A process for identifying and eliminating defects in emulsion and photoresist.

cupric chloride
    A popular etchant for copper.

datum point
    A point used as the basis for reckoning.

datum plane
    A plane from which distances or dimensions are reckoned.

liquid resist
    A photoresist applied to the substrate by dipping, roller coating, curtain

right reading up
    A photomask in which the functional pattern is oriented as shown on

glass sandwich
    A sandwich composed of photomasks made with rigid glass material.

    A series of etched parts tagged into a frame. typically several frets are etched within

reduction marks
    A set of stylized patterns in the border area of an artwork between

    An english abbreviation for one-thousandth of an inch.

yellow room
    An area illuminated with yellow light for handling photo resist coated panels

    An ammonia-based etchant commonly used for copper.

    An accurately scaled pattern (usually a single image) which is used to produce

artwork master
    An accurate one-to-one pattern, usually a single image, which is used to

  1. A unit of measurement (1 nm=10-9 metres) commonly used to define

  2. A unit of measurement of length equal to one thousand millionth of a metre. symbol nm

metal hardening
    A thermal, mechanical, or chemical treatment used to increase the

loop (loupe)
    A small folding magnifying glass.

    A small design used as the symbol of an organisation.

right reading down
    A photomask in which the functional pattern is oriented as shown on

contact printing
    A photographic process in which an image is transferred from one

positivado por contacto .; tiraje por contacto .;
photographic plate
    A photographic layer on "soda-lime-silica" plate glass.

reciprocity law
    A general law for photo chemical reactions which states that the mass of

ley de reciprocidad;
embedded particle
    A foreign particle of solid substance impressed into the surface of

    A dye system in which the background dye darkens upon exposure to uv

    A dye system by which the background dye lightens upon exposure to uv

molecular dye imaging materials
    A designation of a particular diazo material

    A darkroom or processing area lamp which emits light of a colour that will not

luz de seguridad;
characteristic curve
    A curve in which d is plotted against log exposure resulting from

curva característica;
    A curvature across the full width of the strip of metal that renders it somewhat

zahn cup
    A cup with a precisely dimensioned orifice that measures indirectly the

labyrinth screening can
    A complex screening can, with many compartments.

    A general term applicable to any of the specifically defined photographic

cosine law
    A law of illumination which indicates that the flux radiated or received in a

lambert’s . cosmati work polychromatic patterns of stone, glass, or gilding set in marble; commonly;
photographic layer
    A light-sensitive coating containing silver halide which has been

step wedge
    A photographic film containing areas of optical density increasing in constant

mouse bites
    A phenomenon in the edge of undercut photoresist whereby the edge

    A non-silver, room lighting, uv-sensitive coating, usually on a stable transparent

lateral reversal
    A mirror image of the geometric orientation of a pattern.

inversión lateral;
spin coating
    A method of putting a precise thickness of a wet resist coating on a substrate.

aplicación de recubrimiento (cd);
cut and strip
    A method of producing artwork by cutting the pattern, usually on a

    A measure of the degree to which the angle between the x-x and y-y

luminous energy
  1. A measure of rate of flow of flux. it has units of lumen-seconds.

  2. The time integral of luminous flux; given by the product of the luminous flux and the time that the flux is maintai...
luminance (or brightness)
    A measure of flux reflected or emitted from a surface. it has

    A material composed of a stable base such as glass or film with an opaque