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Typo: A Monthly Newspaper and Literary Review, Volume 5
[Multi-Color Printing]
Multi-Color Printing.—Paper and Press for August describes a method new in its application to typography, by which an inventor claims to have obtained sixty-two colors at one impression. It consists in chemical treatment of the inks, by which they may be worked in parallel lines without blending more than the width represented by four points, or a half-brevier. To the ink is first added a mixture (apothecaries' weight) of balsam of copaiba, ¾-lb; glycerine, ¼-lb; crude black petroleum, 30 drops; oil of sandalwood, 120 to 130 drops, according to the drying qualities of the glycerine. Stir enough of this mixture with the ink to bring it to a thick syrup. To this add a little of a mixture of one part chloroform and two parts ether— enough to stagnate the ink. The particles of ink will then appear to be working towards the centre, and this quality the inventor calls stagnation or deadening, the effect of the ether or chloroform being to keep the bands of ink in place, and prevent lateral spreading. Then add about the same quantity of the strongest liquor ammonia as of the chloroform solution. Bubbles will rapidly form in the ink, which is then ready for use.