Читать книгу A Text-book of Paper-making - C. F. Cross - Страница 44
Aniline Sulphate Solution.
Оглавление—With this reagent lignose gives a characteristic deep yellow colouration. A convenient strength is a 2 per cent. solution of the salt. The colour is more quickly developed if the reagent is acidified; a few drops of sulphuric acid should therefore be added.