• <progress id="47fdn"><track id="47fdn"></track></progress>

    <rp id="47fdn"><object id="47fdn"><input id="47fdn"></input></object></rp>


    A two-layer acetate film comprising a transparent base and a red or amber emulsion. Although it has many uses in graphic arts, it was most often attached to paste-up boards in place of halftones which, when the mechanical was photographed as a negative, would leave a blank space into which the halftone negative could be stripped. (It is thus called a red patch or a black patch). It is also used in the making of color separations. See also Amberlith.

    All text and images are licensed under a Creative Commons License
    permitting sharing and adaptation with attribution. (See Copyrights for details.)

    PrintWiki – the Free Encyclopedia of Print
    About    Hosted by WhatTheyThink