THE INDIGENOUS DYES OF BENGAL. 



165 



Table II. — Fastness to Soaping of Dyeings on Silk. 







Intensity and tint after 



Appearance of white 







Dyeing. 



Fulness of 

 shade. 



soaping, washing and 



drying. 

 (Original intensity = I.) 



silk soaped along 



with the dyed 



sample. 





Group. 



Turmeric, raised with acid 



full 



L, duller tint 



much marked 





II— III 



,, alum mordant 



full 



I., duller tint 



considerably ,, 





III 



Kusum 



full 



\ I., tint unaltered 



much , , 





I 



Bakam, alum mordant 



medium 



5 I., much bluer tint 



slightly 



} 



II 



,. alum-soda mordant 



full 



| I., ditto 



considerably ,, 



,, tannin-iron mordant 



full 



> \ I., tint unaltered 



considerably ,, 





III— IV 



Palas, without mordant 



light 



\ L, duller tint 



considerably ,, 





I 



,, alum mordant 



< medium 



I., warmer tint 



considerably ,, 





III 



Latkan, Murshidabad process 



full 



> \ I., tint unaltered 



considerably ,, 





III 



,. Nadia process 



full 



> \ I. , slightly colder 

 tint 



slightly 





III— IV 



Manjista, alum-soda mordant 



medium 



\ I., tiut unaltered 



slightly , , 



} 



III— IV 



,, ditto 



full 



>\ I., ditto 



slightly , , 



,, ditto followed by soap- 













ing and raising 



medium 



I. . ditto 



scarcely , , 



} 



IV 



, , ditto ditto 



full 



I., ditto 



scarcely , , 



Lac, alum mordant 



medium 



I. , ditto 



not ,, 



} 



IV 



,, alum-soda mordant 



full 



I., ditto 



not 



Kamala, without mordant 



full 



I. . ditto 



scarcely , , 





IV 



, . alum mordant 



full 



>i I., ditto 



slightly , , 



} 



III— IV 



ditto* 



full 



\ I., ditto 



slightly 



Singhar, without mordant 



full 



\ L, ditto 



considerably ,, 



} 



II— III 



, , alum mordant 



full 



J I., ditto 



considerably , , 



Tackwood, alum mordant 



med.-full 



I., warmer tint 



scarcely , , 





III— IV 



Orange II, 3% 





<£ I., tint unaltered 



much , , 





I 



Napthole Yellow S., 0-5% 





nil 



not ,, 



} 



I 



4% •• 





nil 



not ,, 



Mentanil Yellow E., 1% 





nil 



much , , 







3% •• 





<|I., tint unaltered 



much , , 



( 



I 



5% •■ 





<| L, ditto 



much ,, 



) 





Scarlet RRR., 3% 





<|l., ditto 



considerably ,, 





I— II 



Fast Pink, 5% 





J I., ditto 



slightly 





III 



Auramine II., 3% 





nil 



much , , 





I 



Magenta, 0-13% 





\ I., tint unaltered 



much , , 



} 



I 







\ I. , ditto 



much ,, 



Safraniu . °'4% 





1 1., ditto 



much , , 



} 



I 



4% •• 





<i I., ditto 



much , , 



Chrysophenine BB., 3% 





\ I., ditto ' 



considerably , , 



I 



III 



6% •• 





> \ I. , ditto 



considerably , , 



} 



Primuline, 2% 





2 I., ditto 



considerably , , 





II- III 



Thiazine Red R., 5% 





> 2 I., ditto 



much , , 





II— III 



Primuline 8° , treated with soda 





I., ditto 



scarcely , , 





IV 



., 8%, developed with 













Phenol 





L, ditto 



scarcely ,, 





IV 



,, 8%, developed with 













P Napthol 





I., ditto 



slightly , , 





III— IV 



Alizarine (Hurst loc. cit., 31 

 appendix) 





I., ditto 



scarcely ., 





IV 



The whole sample was exposed to sunlight for two days before the tests were started. 



