The colour printing of carpet yarns; a useful manual for colour-chemists and textile printers . tted Hne is the absorption curve of a deep shadeof composite blue, showing transmission only of the extremered, green, and blue. Example V.—A beautiful reddish violet, resembling in huethe famous Tyrian Purple is obtained by mixing green withthe pink colouring matter, Bhodamine. The formation ofthis colour affords a good example to the spectroscopist, asthe absorption bands are sharp and characteristic. Rhoda-mine, being a clear pink dye of great brilliancy, absorbs theyellow green, green, and blue
The colour printing of carpet yarns; a useful manual for colour-chemists and textile printers . tted Hne is the absorption curve of a deep shadeof composite blue, showing transmission only of the extremered, green, and blue. Example V.—A beautiful reddish violet, resembling in huethe famous Tyrian Purple is obtained by mixing green withthe pink colouring matter, Bhodamine. The formation ofthis colour affords a good example to the spectroscopist, asthe absorption bands are sharp and characteristic. Rhoda-mine, being a clear pink dye of great brilliancy, absorbs theyellow green, green, and blue green, and transmits the redorange, yellow, blue, and violet. Most of the basic anihnegreens, as we have seen in Fig. 6, transmit a portion ofextreme red along with the green, blue green, and blue. SCIENCE OF COLOUR MIXING. 67 After these two colours are mixed the only light transmittedis red, blue green, and blue, which constitutes the Tyrianpurple hue (see c, Fig. 7). (a) Absorption spectrum of Ehodamine. (b) Basic Aniline Green (China Green). (c) Spectrum of purple composed of a and Fig. 1. Example V.—Showing formation of a Violet colour by mixing RhodaminePink (a) with Green (b). Matching Dyed and Printed Yarns,—T\ie colour pastes, afterbeing prepared and mixed in the colour-house, are printed, orwhat is termed swatched on small skeins of yarn as trials, andafter going through the regular process of steaming, washing,and drying, these swatches are submitted to the colour mixer,who compares or matches them with the standard specimenspreserved in the colour-book. The matching of the preparedshades is one of the most important duties of the tapestrycolour chemist, and often it requires no little care to obtain aperfect match with some shades. The quality of the daylightused must be considered, as the appearance of many colours isgreatly influenced by the kind of light which illumines will be considered in our next chapter. CHAPTEK X. THE MATCHING OF COLOURS
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