Fay, Irving W. (Irving Wetherbee), 1861-1936 · New York, D. Van Nostrand Co. · leaf 111
anged to reddish brown by sulphuric acid is restored by washing in water. Victoria Blue 4R. This dyestuff is in many respects similar to the preceding. It is formed from the same compound, tetramethyldiaminobenzophenone; or from tetramethyldi- aminobenzhydrol, which differs from it by an accession… … Victoria blue 4R.
Coal-tar colors · Dyes and dyeing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
