A dictionary of applied chemistry Volume 1

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ... Scarlet G (K.): HSO.C.HN.C.H.NC.oH.OH. Prepared by the action of diazotised aminoazobenzenemonosulphonic acid on 0-naphthol. The scarlet solution in water gives a brown precipitate with sodium hydroxide, and becomes yellower on addition of hydrochloric acid when dilute, but in concentrated solutions a lightred precipitate is produced. The solution in strong sulphuric acid is green, becoming red on dilution. Literature--E. P. 5003 of 1879; D. R. P. 16482. Milling Orange (D.): HSO, C.HN.C.HN.C.HCOjHJOH. Prepared by the action of diazotised aminoazobenzenemonosulphonic acid on salicylic acid. Orange-red solution in water, giving greyish yellow precipitate with hydrochloric acid, and a dark-red solution and precipitate with sodium hydroxide. The solution in strong sulphuric acid is violet, giving a greyish-yellow precipitate on dilution. Biebrich Scarlet; Ponceau 3 RB (A.); New Red L (K.); Imperial Scarlet (By.); Ponceau B (M.); Fast Ponceau B (B.); Double Scarlet (K.): HSO,-C,H4N,C,H,(SO3H)NJ-C10H,OH. Prepared from diazotised aminoazobenzenedisulphonic acid and £-naphthol. Solution not precipitated by alkali; a brown flocculent precipitate by dilute acids. Dissolves in strong sulphuric acid with a green colour, becoming i first blue and finally brown and precipitating on dilution. Literature.--E. P. 5003 of 1879, 529 of 18?0; D. R. P. 16482, 16483; A. P. 224927, 224928; Nietzki, Ber. 1880, 13, 800, 1838; Miller, ibid. 542. 803, 980. Croceine Scarlet O extra (K.): HS03 C,H4 N i'C,H»(S03H) N? CioHi(SO»H)-OH. Prepared by the action of diazotised aminoazobenzenedisulphonic acid on /3-naphthol-8-sulphonic acid. The yellowish-red aqueous solution gives a violet coloration with hydrochloric acid or sodium hydroxide. The solution in strong sulphuric ac...