Colour-Matching on Textiles; A Manual Intended for the Use of Dyers, Calico Printers, and Textile Colour Chemists, Containing Coloured Frontispiece, Twenty-Nine Illustrations, and Fourteen Dyed Patterns in Appendix (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...and Ramie or China grass, exhibit their fluorescence; but if the fibre be a lustreless one, like cotton or linen, where the rough surface of the fibre scatters the incident light, then this property is destroyed. This may readily be observed by comparing the hues of rhodamine dyed upon silk and upon cotton. The light reflected from the dyed silk is of a more orange cast than that of the dyed cotton, which appears bluish beside the silk. This is owing to the fluorescent orangecoloured light of rhodamine being reflected from the smooth and shining outer surface of the silk; while the dyed cotton, having no such power of surface reflection, is devoid of the orange-coloured rays. (See their microscopic appearance in Figs. 21-24, p. 62.) In matching strongly fluorescent shades, some little peculiarities are observed which are worthy of notice. For example, a decided difference in hue is observed between their reflected light and transmitted light aspect. A peculiar tone of violet, or heliotrope, may be produced by dyeing with rhodamine, or any of the fluorescent eosine pinks, combined with any of the acid greens, like wool green. On viewing the shades by reflected light, i.e., looking down upon them, they are of a peculiarly reddish hue, and change in their aspect when held in various different directions. This reddish light is owing to the fluorescent property of the eosine pink. If the shades be held up to the light and viewed "overhand," or if the threads of the swatch be held up and the light allowed to filter through them, it will be observed that the hue becomes decidedly bluer, approaching more to the appearance of the ordinary bluish methyl-violets. This difference in hue between the reflected and transmitted light aspects of the dyed colour is...