The colour printing of carpet yarns; a useful manual for colour-chemists and textile printers . known Fraunhofer hues in the solar spectrum. {a) represents the absorption spectrum of Naphthol Yellow,which shows that this dye absorbs the violet, blue-violet,and blue, and freely transmits the remainder of the spectrum,green, yellow, and red. (&) represents the absorption spectrum of Indigo Extract,which shows free transmission of the extreme red, and COLOUR MIXING. 63 absorption of the orange red, yellow, and yellow green, tothe lines E in green, and transmission of green, blue, andviolet. (c) r
The colour printing of carpet yarns; a useful manual for colour-chemists and textile printers . known Fraunhofer hues in the solar spectrum. {a) represents the absorption spectrum of Naphthol Yellow,which shows that this dye absorbs the violet, blue-violet,and blue, and freely transmits the remainder of the spectrum,green, yellow, and red. (&) represents the absorption spectrum of Indigo Extract,which shows free transmission of the extreme red, and COLOUR MIXING. 63 absorption of the orange red, yellow, and yellow green, tothe lines E in green, and transmission of green, blue, andviolet. (c) represents the spectrum of the green colour producedby combining (a) and (6), viz. : Naphthol Yellow and IndigoExtract. It shows only the blue, bluish-green, green, and aportion of red to be transmitted. A green colour showing spectrum hke (c) cannot be a pure bright colour,irom the amount of red it contains. If, instead of IndigoExtract, a greenish blue, showing absorption in the red,were substituted, a pure and bright tone of green would beobtained. # A B C d D £ f G H ^. Fig. 4. Example II.—Showing how Eed and Green produce Black. Examjdlell.—A mixture of red and green, when sufficientlystrong, will produce a black. All the coloured rays trans-mitted by the one are absorbed by the other; hence darkness?or black is the result. It is seldom that two complementary•dyes are found of sufficient purity to produce a pure black,but with three colours a good dense black can easily be?obtained. This fact is taken advantage of in dyeing and•colour mixing when jet black is required ; and also in pro- 64 THE COLOUE PRINTING OF CARPET YARNS. ducing sad shades, , colours darkened or saddened witha more or less proportion of grey, produced by complementarycolours coming in contact. A splendid, though somewhatexpensive, black for tapestry carpet printing can be madeby combming Archil with indigo extract. These two arecomplementaries to each other. The following abso
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