Colour Prin

alues-Some useful Hints-Bronze Blue-Vermilion-In

gether the various colours so as to produce pigments of suitable working consistency. The most useful and the commonest form of reducing medium is a linseed oil product, known in its prepared state as a lithographic varnish, with a supplementary title indicating its specific character. Its value to the lithographic printer lies mainly in the fact that when it is f

lly as "boiled linseed oil." As this boiling is continued the fumes which quickly rise can be ignited, and the liquid soon assumes a syrupy or stringy character, according to t

generally recognised fact that, beyond a certain point, lithographi

t all printing inks must be reduced to a suitable working consistency. To accomplish this, and at the same time

e and logical explanation of these peculiarities which is both interesting and suggestive. Whatever the character of a reducing medium may be, its effect on the strength of colour will of course be in proportion to the quantity used. In all probability 1 oz. of a solid oil composition, otherwise known as lithographic reducing medium, would soften down a quantity of printing ink for which

gments which cannot fail to prove disastrous. The tendency of lithographic varnish is to bind the colour pigments together, and this should not be entirely counteracted by the addition of fatty composit

is, in fact, a "constitutional weakness" which cannot apparently be prevented, but which is fortunately not incurable. The addition of a little Canada balsam to bronze-blue ink will add considerably to its w

ducing medium might also prove beneficial. Referring once more to the fact that vermilion, as distinguished from its imitation, is unusually heavy, etc., it may be useful to know that for

eir working qualities present no exceptional difficulties, and their employment either under primary or secondary condition

eriment, it is a safe plan to mix it a little lighter than will be required. For obvious rea

nd kept as stock shades. Fleshes, pink, blues, greys, etc., are all useful colours which are in constant use. A warm or cold tone could be imparted to a stock grey as r

aphic colour printing generally, they may with equal e

decoration will be fully dis

e paper is of a thin, tough quality, and the first printing is usually a white of good covering power and exceptional opacity. It is not necessary to print a solid white groundwork for the coloured design. If an intense brilliant colour is required by transmitted light the omission of part of the white printing will add considerably to the effective character of the

the transfer, will then be made in accu

any of the colours by an omission of the white printing from the p

d more or less transparent by co