The papermaker's pocket book by Beveridge James paper maker

Author:Beveridge, James, paper maker. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Papermaking
Publisher: New York, Van Nostrand
Published: 1911-03-25T05:00:00+00:00

require the paper stuff to be slightly acid in character. These dyes are best added to the engine before sizing. Safranine must be used in the cold, the others warm.

Phosphine and Grenadine (5 per cent, solution) are treated like fuchsine or magenta.

Alkali Blue (8 per cent, solution) is often used because of its greater fastness towards light. Dissolve the dye in hot water which has been rendered alkaline with soda, and then cool. The cold solution is very stable, but must be used dilute. Dye in the cold, and after sizing. The paper stuff must have an acid reaction.

VEGETABLE DYE-STUFES.. Yellow. —Quercitron 'for light, shades is the colouring matter obtained from the bark of the North American black oak (Quercus nigra). The dye is extracted by digesting the bark, wrapped in a bag, in successive quantities of fresh water at 212° Eah. The liquors are then mixed and purified from tannin bodies by addition of a weak solution of glue, otherwise the shade is apt to be of a greenish tone due to the formation of black-coloured lakes by the tannin, with traces of iron salts contained in the alum, &c. Quercitron is best suited for deepening blacks, and for this purpose it is not necessary to remove the tannin. In combination with weld extract (1 pt. weld to 10 pts. quercitron) purer yellow tones are obtained. The shade in this case is brightened with tin crystals. Quercitron does not yield bright tones of yellow. Weld (reseda luteola) produces the most stable and brightest yellows of the vegetable dyes. The presence of iron salts imparts a greenish shade to the colour. Curcuma is not extensively used. Yellow or Brazil Wood yields yellows of a greenish shade, which also limits its application. Mordant with acetate and sulphate of alumina. Annatto. —This extract is prepared by digesting 10 lbs. of the dye-stuff in 30 gallons of boiling water, in which 10 lbs. of soda crystals have been previously dissolved. Filter through a linen bag. Excess of alkali intensifies the yellow colour, whilst a diminished quantity turns it red. Applicable in combination with weld and quercitron for golden yellow and orange tones. The pulp should be dyed first and alum added afterwards. Brighten with magenta, crocein scarlet, or orange.

Red. — Red Wood, Ptrnambuco Wood, Sfc. These colouring matters are. not extensively used, owing to their fugitive character. They form red lakes with alumina, which are brightened with tin crystals. Cochineal. —This is really an animal dye, being the body of a female insect found in Central America. The large grey variety is the best. The

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