. A practical handbook of dyeing and calico-printing. With eleven page-plates, forty-seven specimens of dyed and printed fabrics, and thirty-eight woodcuts . 11 Magenta. water and to dye with the strained decoction a known weight of fine whitewoollen yarn or cloth. By thus comparing different samples, their respectivetinctorial power can be readily ascertained, and the presence of tarry matters,unconverted aniline, &c, may be detected by the flatness and brownish castof the colour. Sugar is sometimes used as an adulterant. This may bedetected by treating the sample with concentrated alcohol. T
. A practical handbook of dyeing and calico-printing. With eleven page-plates, forty-seven specimens of dyed and printed fabrics, and thirty-eight woodcuts . 11 Magenta. water and to dye with the strained decoction a known weight of fine whitewoollen yarn or cloth. By thus comparing different samples, their respectivetinctorial power can be readily ascertained, and the presence of tarry matters,unconverted aniline, &c, may be detected by the flatness and brownish castof the colour. Sugar is sometimes used as an adulterant. This may bedetected by treating the sample with concentrated alcohol. The magentadissolves and is filtered off, whilst the sugar remains behind undissolved. The following method is used to ascertain whether a magenta is a pure saltof rosaniline or is contaminated with mauvaniline, violaniline, chrysotoluidine,&c. The colour is dissolved in as little alcohol as possible, the solutiondiluted with its own bulk of water or rather more, and a drop is taken up by. Ponceau. PERKINS VIOLET, OR MAUVE. 187 means of a glass rod and applied to a piece of white blotting-paper. Ifmore than one colouring matter is present the different shades will diffusethemselves in concentric circles and may be distinctly seen. This method isstill more applicable to the aniline violets and blues, which are frequentlyheterogeneous. Aniline Crimson. The crude magenta-cake without any purification is sold under this name,and is used in dyeing certain maroons, browns, clarets, and other compoundcolours. The colour, well bruised or broken up into powder, is placed in a suitablestoneware vessel and well stirred up with its own weight of hydrochloric this process the fumes given off should be carefully avoided. After thecolour has steeped for a short time in the acid, boiling water is added sufficientto dissolve the whole. The solution thus obtained is carefully strained, and isthen ready for use. To correct the acidity of the colour a small quantity ofammonia i
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectdyesanddyeing, bookye
