Fay, Irving W. (Irving Wetherbee), 1861-1936 · New York, D. Van Nostrand Co. · leaf 185
174 COAL-TAR DYES When the H. acid (see under Lanacyl violet) is diazotized and combined with the 5-amino-l-naphthol, the blue dye is produced, the sodium salt of which is: OH … Lanacyl blue B.B. The dyestuff of commerce is a black powder which dissolves to a color between a red and a bluish violet. Hydrochloric acid produces sHght effect; but caustic soda acts upon this as upon lanacyl violet, turning it an orange red. Strong sulphuric acid dissolves it with a blue color…
Coal-tar colors · Dyes and dyeing
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