THE INDIGENOUS DYES OF BENGAL. 



85 



Table I. — Fastness to Light of Dyeings on Cotton.. 



Dyeing 



Fulness 



of 

 shade. 



No. of days' 



bright sunshine 



required to 



produce first 

 sign of fading 



No of days' 



bright sunshine 



required to 



reduce shade 



to one quarter 



original 



intensity. 



No of days' 



bright sunshine 



required to 



completely 



bleach. 



Group. 



Turmeric with acid 

 „ ,, alum 



full 

 full 



I 

 I 



2 



2 



4 

 4 



} ' 



Kusum 



light 



I 



2 



8 



1 , 



»> 



medium 



I 



2 



15 



1 



>f • • 



full 



I 



3 



* 



1 

 / 



Bakam (Tannin-tin mordant) 



full 



5 



15 



* 



III 



, , (Tannin-iron mordant) 



full 



8 



* 



* 



IV 



Palas without mordant 

 ,, with alum 



light 

 medium 



1 

 1 



2 

 3 



5 

 10 



! ' 



Latkan (Murshidabad process) 



medium 



1 



2—3 



* 



} ' 



„ (Nadia process) 



medium- full 



1 



2—3 



* 



Manjista without mordant 



light 



2 



3 



7 



*\ 



„ (alumina mordant) 



medium-full 



2—3 



8 



* 



L 11— in 



„ (Turkey- red mordant) .. 



medium 



2—3 



9 





) 



Catechu 



light 

 medium 



3 

 3 



9 

 12 





\ 11— in 



Red Sandal 



medium 



1 — 2 



12 



* 



1 



Padauk 



medium 



1 — 2 



6 



19 



1 



Eosin (sodium stannate mordant) 



light 



T 



1 



1 



1 



Congo red 0*04% 



light 



I 



1 



3 





,. 0*17% 



medium 



I 



1 



9 



) 



.. .» 0-35% 



medium 



I 



1 



9 



( If 



» »» 1*75% 



full 



I 



2—3 



14 



' 



Primuline (5% developed 

 £ Napthol) 



full 



I 



3 



19 



it 



Primuline (5% developed Resorcinj 



full 



I 



3 



15 



it 



Magenta o # 02% 



light 



I 



3 



5 



! * 



1*0% 



full 



3 



10 



* 



vSafranine o*i% 

 3-4% 



light 

 full 



2 



7 



6 

 * 



* 



} nit 



Primuline (5% developed Phenol) . . 



full 



5-6 



20 



* 



in— rvt 



Alizarine (alumina mordant) 



light 



12 



* 



* 



*) 



(Turkey red ,, ) .. 



light 



8 



* 



* 



IV 



" ' >> !» J) ) 



full 



* 



* 



* 



) 



* More than 23 days. 



t Classified by Cassella & Co. (loc. cit.). 



