231 



Azo rubin S (103), color only partially precipitated by hydrocholoric acid. Dyes 

 wool red from acid hath luit not from alkaline bath. Does not readily dye unmor- 

 danted cotton in either hath. Color not precipitated by barium chlorid. 



Dyes wool yclloir. 



Chrysamin R (269), hydrochloric acid gives a brown precipitate, sodium hydroxid 

 a red solution. Barium chlorid and .-odium bisulphite reagent each u r i\es a yellow 

 precipitate and colorlrs< filtrate. Dyes wool pale yellow from a neutral bath and 

 unmordanted cotton orange yellow from a neutral or alkaline bath. 



nool and unmordanted cotton brownjrom <i<'i<l bath. 



Bismarck brown IT, . decolori/.ed by stannous chlorid and on adding hydrogen 

 dioxid a color somewhat redder than the original color appears. Color precipitated 

 by tannin rea-ent. Color absorbed from alkaline solution by ether, and on adding 

 dilute acetic acid to th- ether solution, the color is taken up by the acid. 



Kc.-orrin brown l:',7 . decolori/ed by stannous chlorid. No color returns on add- 

 ing hydrogen dioxid. No? precipitated by tannin rrau'rnt. Color absorbed by 

 fuller's earth. 



M OOi : r\Kii\i.M tMOmmi in AiiMiNUlf 



HVDHOXID. 



Dye ' bath. 



SECTION I. Sodium hydroxid causes a distinct .han-c in color of water solution. 



>dium hydroxid tun -Union violi-t. 



Ponceau i>-d W.K.I is blui-h rtxl, turned blue by hydrochloric acid or 



sulphuric a<id. color in wo<,l ,: lution. Hydro- 



chloric acid turns water solution \iol.-i. more turns it blur. 

 (2) Sodium hydroxid turns water solution brown. 



P.rilliant rrorein lit, . hydrochloric acid produces little change in color of water 

 solution 



Crystal ponceau (A) ((H>, d\.-,| wool turned violet by hydnx-hlorir arid and blue 

 ;lphuric arid. 



in -<arlct .; l: \ HI: . . 1 . , d wtM.l turned red \ iolet by hydrochloric acid or by 

 sulphuric acid. 



V) (106), color of dyed wool not changed by hydrochloric acid. 

 dium hydroxid turns watrr solution yellow. 



Palatin scarlet (53), dyed I !<>r not much changed by hydro- 



chloric acid, but sulphuric acid turns it violet and u'ivrs a violet eolation. < )n <lilution 

 wool has nearly original 



DON II. Sodium hydroxid does not cause a distinct change in the color of the 

 water solution. 



Group I. Sulphuric acid turns dyed wool blue or violet and gives a blue or violet 

 solution. Dyed wool is bluish red. 



Bordeaux B (A) (65), hydrochloric acid turns dyed wool violet. 



x S (A) (107), scarlet B K K . P) closely related to Bordeaux S. 

 Group II. Sulphuric acid has little or no effect on color of dyed wool. Dyed wool 

 is scarlet. 



Ponceau G (A) (55), barium chlorid gives an orange red precipitate, wool dyed 

 orange red. 



Ponceau 3 R (A) (56), barium chlorid gives a red precipitate. Dyes wool more red 

 than (55). 



