ow, most of the blue,and all the violet are absorbed. In all observations of colours with the spectroscope it isbest to employ either the purest sunlight; or, what is con-sidered even better, the electric arc light. In order to givegreater accuracy to the descriptions of colour spectra… … Fig. 21.—Representation of the absorption spectrum of the green producedby the admixture of picric acid and indigo extract. A, intensity ofabsorption of spectrum shown by shading ; B, by the curve. 3rd, That the absorption bands be carefully measuredand reduced by an interpolation curve to their…
Color in the textile industries · Dyes and dyeing
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