206 DRYING PRINTED SHEETS. hung up for some time longer ; but it is best to test one of them by laying over it a piece of printing paper, and rubbing the back of that with a paper knife. If, when removed, there is no set off, it may be taken for granted that the sheets are ready to be pressed or… … DRYING RACK. for printing upon require to be exposed for many days before they are thoroughly dry. Artificial Drying of Ink. — If it be necessary to dry a few printed sheets immediately, for any sudden emergency, such as completing the sheets of a volume, calcined mag¬ nesia may be dusted over…
Printing · Color printing
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