174 Certain New Derivatives in the Aromatic Series. 



intelligent, conscientious work of able and competent chemists of the 

 new school. 



In lieu of an historical introduction, I have drawn up a list of 

 all the important dyes no^v prepared from coal-tar, and have indi- 

 cated their modes of manufacture. This table forms no part of my 

 thesis proper, which is strictly original work, but is offered to show 

 the present status of the color industry, and to give its salient points. 

 The list by no means comprises the whole number of dyes which 

 have been made, but simply gives the principal ones, and those 

 which have obtained a permanent place in the commercial w^orld ; 

 and after all, that is a fair test of the usefulness and intrinsic value 

 of any product. 



NiTRO Dyes. Type, R.XO^. 

 Naphtol Yellow. HNO3 on a-Naphtoltrisulphonic acid, 1:2:4:1. 



AzoxY Dyes. Type, | ,0 



R.N/ 



Curcumine. p-Nitrotoluolsulphonic acid and KOH. 



Hydrazone Dyes. Type, R— NH— NH— R. 



Tartrazine. Phenylhydrazinemonosulphonic acid and dioxytar- 

 taric acid. 



Azo Dyes. Type, R.N = N.R. 



Cochineal Scarlet G. Aniline and alphanaphtolsulphonic acid 

 C, 1 :5. 



Ponceau AGB. Aniline and betanaphtolsulphonic acid, Schief- 

 fer's, 2 : 6. 



Orange G. Aniline and betanaphtoldisulphonic acid, " G", 2:6:8. 



Chrysoidine. Aniline and phenylenediamine. 



Wool Scarlet R. Xylidine and alphanaphtoldisulphonic acid, 

 Sehcellkopf's, 1:4:8. 



Palatine Scarlet. Metaxylidine and naphtoldisulphonic acid. 



Erika B. Dehydrothiometaxylidine and alphanaphtoldisulphonic 

 acid. 



Fast Red A. Naphthionic acid, 1 : 4, and betanaphtol. 



