Book Description

Excerpt from Chemistry and Analysis of the Permitted Coal-Tar Food Dyes For guinea green B - Transfer to a 500 c. C. Volumetric flask that volume of the master solution which contains 5 grams of the dye. Add water, if necessary, to bring the volume to 400 c. 0. Add 8 c. C. Of strong ammonium hydroxide and 125 grams of sodium chloride (free from sul hates) and dilute to 500 c. C. With a saturated solution of sodium 0 oride. Shake vigorously to precipitate the dye and filter through a dry paper. Neutralize 200 c. C. Of the filtrate with dilute hydrochloric acid (1 +9) and add 5 c. C. In excess. Complete the determination and calculate as direct-cd in the first paragraph of this section, beginning with Heat to boiling and add a slight excess of hot 10 per cent barium chloride solution. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.