Nietzki, Rudolf, 1847-1917, Collin, A., Richardson, W. · London, Gurney & Jackson · leaf 67
48 CHEMISTRY OF ORGANIC DYESTUFFS, The formula with /3-naphthol : … is probably correct, but has not been proved to be absolutely certain. In general, azo-compounds containing the chromophoric and auxochromic groups in the ortho position are far more valu- able as dyes than their allies of the para-series. The latter have the undesirable property of altering their…
Dyes and dyeing -- Chemistry · Coal-tar colors
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