THE INDIGENOUS DYES OF BENGAL. 



89 



Table IV. — Fastness to Acid of Dyeings on Cotton. 



Dyeing. 



1 

 Fulness 



of 

 shade. 



Appearance after 



treatment with acid, 



washing and 



drying. 



Colour of acid 

 bath afterwards. 



Group. 



Turmeric with acid 

 „ with alum 



full 

 full 



no change 

 no change 



light yellow 

 light yellow 



J III— IV 



Kusum 



light 







) 



»i 



medium 







[ III— IV 



>> ' ' 



full 



no change 



light red 



) 



Bakam (Tannin-tin mordant) 



full 



no change 



light yellow 



III— IV 



,, (Tannin-iron mordant) 



full 



much lighter 



light yellow 



I 



Palas without mordant 



light 



much lighter 



no colour 



I 



,, with alum 



medium 



almost washed out 



light yellow 



Latkan (Murshidabad process) 



medium 



no change 



very light yellow 



I III— IV 



,, (Nadia process) 



medium-full 



no change 





Manjista without mordant 



light 



considerably lighter 



no colour 



II 



„ (alumina mordant) 



medium-full 



slightly lighter 



medium orange 



III 



,, (Turkey-red mordant) . . 



medium 



no change 



no colour 



IV 



Catechu 



light 



slightly lighter 



no colour 



}"' 



»> 



medium 



slightly lighter 





Red Sandal 



medium 



no change 



no colour 



IV 



Padauk 



medium 



no change 



no colour 



IV 



Eosin (sodium stannate mordant). . 



light 



no change 



no colour 



IV 



Congo red, 0-04% 



light 







\ 



„ „ 0-17% 



medium 









„ „ o-35% 



medium 







T 

 1 



>, ,, 175% 



full 



no change* 



no colour 



/ 



Primuline (5% developed /3 Napthol) 



full 



no change 



no colour 



IV 



.» (5% developed Resorcin) 



| full 



no change 



no colour 



IV 



Magenta, o - 02% 



light 







}xv 



I'0% 



full 



no change 



no colour 



Safranine, o-i% 



light 







\lll— IV 



3-4% 



full 



no change 



light red 



Primuline (5% developed Phenol) 



full 



no change 



no colour 



IV 



Alizarine (alumina mordant) 



light 



: considerably lighter 



light yellow 



II 



(Turkey-red ,, ) 

 »» ( >> )> ) 



light 



full 



no change 



no colour 



}:v 



* Completely blue whilst in acid bath. 



