166 



MR. E. R. WATSON ON 



Table III. — Fastness to . 



Alkali of Dyeings 



on Silk. 











Intensity and tint after 









Dyeing. 



Fulness of 



treatment with alkali, 



Colour of alkaline 





Group. 



shade. 



washing and drying. 



bath afterwards. 









(Original Intensity = I.) 









Turmeric, raised with acid 



full 



I., duller tint 



full orange 





II 



, , alum mordant 



full 



I., much duller tint 



medium orange 





II— III 



Kusum 



full 



nil 



medium orange 





I 



Bakam. alum mordant 



medium 



\ I., much bluer tint 



medium pink 



} 



II 



, , alum-soda mordant 



full 



\ L, much bluer tint 



full claret 



,, tannin-iron mordant 



full 



I., tint almost un- 

 changed 



full claret 





III— IV 



Palas, without mordant 



light 



\ L, much duller tint 



medium orange 





II 



, , alum mordant 



medium 



I., warmer tint 



medium orange 





II— III 



Latkan, Murshidabad process 



full 



I , tint unaltered 



med.-full yellow 



~\ 



III 



,, Nadia process 



full 



I., ditto 



medium yellow 



J- 



Manjista, alum-soda mordant 



medium 



I., ditto 



light salmon-pink 



1 

 1 





,, ditto 



full 



I., ditto 



light salmon-pink 





,, ditto followed by soap- 









1 



IV 



ing and raising 



medium 



I., ditto 



colourless 





,. ditto ditto 



full 



I., ditto 



colourless 



1 



J 





Lac, alum mordant 



medium 



I., ditto 



colourless 



} 



IV 



,, alum-soda mordant 



full 



I., ditto 



light pink 



Kamala, without mordant 



full 



I., ditto 



light yellow 





III— IV 



alum mordant 

 ditto* 



full 

 full 



I., ditto 

 I., ditto 



medium yellow 

 medium yellow 



} 



III 



Singhar, without mordant 

 ,, alum mordant 



full 

 full 



>|L, ditto 

 >|L, ditto 



med.-full yellow 

 med.-full yellow 



} 



II— III 



Jackwood, alum mordant 



med.-full 



I., warmer tint 



medium orange 





III 



Orange II., 3% 



.. 



\ I., tint unchanged 



full orange 



I 



Naphthoic Yellow S. , 0-5% 





nil 



light yellow \ 



I 



4% 





nil 



med.-full yellow 





Metanil yellow E., 1% 





\ I., tint unchanged 



medium yellow 



) 





> ; > > 3/0 





<£L. ditto 



med.-full orange 



II 



, > > ) 5/0 





h I., ditto 



full yellowish 













orange. 





Scarlet RRR., 3% 





\ I., ditto 



full crimson 



I 



Fast Pink, 5% 





|L, ditto 



light-med. pink 



II— III 



Aur amine II., 3% 





I., ditto 



colourless 





IV 



Magenta, 0-13% 





I., ditto 



colourless 



} 



IV 



T°/ 



J J *■ /O 





I., ditto 



colourless 





Safranin, 0-4% 





I., ditto 



colourless 



\ 



III 



4% 





I., ditto 



med.-full pink J 



Chrysophenine BB., 3% 





I., ditto 



almost colourless i 

 light yellow J 



IV 



6% 





I., ditto 



Primuline, 2% 





I., ditto 



colourless 



IV 



Thiazine Red R., 5% 





>\ I., ditto 



full crimson 



II— III 



Primuline 8% treated with Soda 





I., ditto 



colourless 



IV 



,, 8% developed with 













Phenol . . 





I., ditto 



colourless 





IV 



,, 8% developed with 













(8-Napthol 





I., ditto 



colourless 





IV 



Alizarine (Hurst loc. cit., 31 













appendix) 





I., ditto 



colourless 





IV 



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



