ment the lactose (a reaction that converts the leuco-fuchsin again 

 into the dve fuchsin). 



PARA-FUCHSIN C. I. NO. 676 



Synonyms: Basic rubin. Pararosanilin. Para-magenta, 



H CI 



\l 



^= 



/ " 



H 



(A basic dye; absorption maximum about 539.) 



This dye is frequently sold as basic fuchsin. Investigation, in 

 fact, shows that most of the stains sold under that name are really 

 pararosanilin chloride. The acetate is also sometimes encountered. 

 It is evident that for many purposes for which fuchsin is used, this 

 is satisfactory; but a recent investigation by the Commission shows 

 that it is ordinarily less desirable than the higher homologs, es- 

 pecially rosanilin. 



ROSANILIN 



This compound is mono-methyl fuchsin, or triamino-tolyl- 

 diphenyl-methane chloride. 



XH2 



{A basic dye; absorption maximum about 542.) 



It is not a textile dye, and is not found free from pararosanilin 

 unless specially prepared. One stain company, it is found, has 

 supplied it as "basic fuchsin, for Endo medium." For this par- 

 ticular purpose, indeed, rosanilin hydrochloride proves to be the 

 best adapted of any of the basic fuchsins; and, so far as it has been 

 investigated, it is a very satisfactory stain for all purposes for 

 which basic fuchsin is ordinarily used. 



BASIC FUCHSIN C. I. NO. 677 



Synonyms: Diamond fuchsin. Magenta. Rubin. Anilin red. 



Various shades occur, denoted by different designations. 



This dye, as furnished for textile purposes, is a mixture in about 

 equal parts of pararosanilin and rosanilin. 



As the greater methyl substitution of the latter compound causes 

 it to have a deeper shade than pararosanilin, the dye varies in 



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