Lectures on coal tar colours, and on recent improvements and progress in dyeing and calico printing, embodying copious notes taken at the last London International Exhibition.. (1860)
is seen at a glance; but a test-tube will answer per-fectly well if two or three different degrees of dilution be tried in succession.When the light transmitted through an alkaline solution of purpurine ofsuitable strength, after being limited by a slit, is viewed through a prism, Fig. 1.—Solution… … two remarkable dark bands of absorption (Fig. 1) are seen about the greenpart of the spectrum, comprising between them a band of green light,which, though much weakened in comparison with the same part of theunabsorbed spectrum, is bright compared with the two dark bands, whichlatter in a…
Coal-tar colors · Calico-printing · Dyes and dyeing
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