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Pure Gum is used for processing lithographic images. Stabilised Gum is made from a mixture of gums and sugars. Prepasol sensitises metal plates for grease. Dilute 1:5 with water for zinc; 1:3 for aluminium. Dry. Erasol is a caustic solution used for deletions. Lithowashout is asphaltum based. Litho Varnish modifies ink consistency and tack, and is also used to condition nap rollers. American Graphics .
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