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

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

    Gum Etch

    Also called 1:32 gum etch, a substance, produced by mixing one part 85% phosphoric acid with thirty-two parts of 14o Bé gum arabic, used to desensitize offset printing plates and/or chrome-plated dampening system rollers as a means of restoring their ink-repellency and water-receptivity. Metal dampeners can lose their water-receptivity over time or with use, as grease collects on their surfaces, and become increasing receptive to ink, which can produce a variety of press and printing problems. (See Dampening System.)

    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