INDIGO. 



17 



India indiscos, the brightness thereof having been Remarks 



^ ^ ° on East- India 



exemplified in the patterns No. 1, 2, 3. indigo. 



I took the indigo liquor remaining from the 

 last experiment, and prepared therewith the 

 liquid used by the calico-printers, called " pencil 

 blue." 



I formed with it the blue spots on the printed 

 velveret patterns Nos. 7, 8, and 9. You will find 

 this colour both bright and durable. 



From the circumstances I have related, I am 

 induced to believe that the colouring matter of 

 your four specimens of indigo is of very good and 

 similar quality ; but they differ in value, from 

 accidental circumstances or mismanagement in 

 their formation. I suppose the East-India indigo 

 A to be worth lis. per lb., and equal to any 

 Spanish flora or Guatemala ; that marked B is 

 only worth 5s. 6d., C 8s. 6d., and D 6s. 9d. per 

 pound. 



Thus far have I confined my remarks to the 

 samples you have sent me. It would lead me too 

 far into the subject, if I was to mention to you 

 many experiments I have made on East-India 

 indigo procured from other persons. The result of 

 all of them confirms me in opinion, that the East- 

 Indies can furnish every kind of indigo wanted in 

 Great Britain. 



In one pound of East-India indigo taken pro- 

 miscuously out of a large package, and which I 



c afterwards 



