They may even be diazotised and developed with beta-naphthol and phenylene diamine.
"The Dyeing of Cotton Fabrics" by Franklin Beech
Their discovery not only increased the consumption of beta-naphthol, but also that of the bases which were used for diazotising.
"Coal" by Raphael Meldola
This compound is rendered insoluble when precipitated directly on barytes, by acting on it with an alkaline solution of beta naphthol.
"Paint Technology and Tests" by Henry A. Gardner