The manufacture of intermediate products for dyes (1919)
Cain, John Cannell, 1871-1921 · London, Macmillan · leaf 199
with 40 grams of hydrochloric acid (20-5° Be., free from chlorine) and 400 grams of water ; 656 grams of nitronaphthalene (91*5 per cent., setting point 50-5°) were added within three to four hours (20-25 grams every five minutes) at 80-85°, and the mixture was kept at this temperature for seven to… … FIQ. 22. and Harmsen ("Die Fabrikation der Theerfarbstoffe/' 1889), nitrate 10 parts of naphthalene with a mixture of 8 parts of nitric acid (D 1-4) and 10 parts of sulphuric acid. The temperature is raised gradually and very slowly to 70° and the mixture stirred for six hours longer at this point,…
Dyes and dyeing -- Chemistry
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
