440 The Art of Dyeing . 



Solution of potash induces in the former yellow spots, 

 with greenish borders, which are removed by vinegar. 



Lime water, ammonia, and vinegar, have no action upon 

 either. 



Lime juice produces on both white spots, removeable by 

 ammonia. 



The tin mordants discharge both white. 

 Solution of chloride of lime bleaches the printed places 

 but imperfectly. 



Yellow wood. — Calico, unimpregnated with mordant, 

 when boiled for half an hour in a solution of yellow wood, 

 acquires a straw colour. When dipped in a solution of 

 iron, consisting of 10 lbs. iron alum, and 600 lbs. water, a 

 light yellow is formed. 



Remarh. — When quercitron is boiled with unmordanted 

 cotton, the latter acquires not a yellow, but a reddish co- 

 lour, which will be but slightly tinged, and removed by iron 

 alum, alum mordant and lime water. 



When boiled in Persian berries, the calico acquires a 

 gray lustre, which will be little changed by the mordants. 

 When boiled with willow and oak bark, the calico ac- 

 quires a reddish colour, which will neither be altered, nor 

 removed by mordants. Fernambuc colours the calico, 

 pink. 



Avignon madder gives a dark pink, which will be little 

 altered by mordants. 



Logwood. — The mode of dyeing and mordanting is that 

 formerly described. When the water employed for dyeing 

 contains lime, the solution of logwood should first be boiled 

 and skimmed, and then be brought in contact with the 

 calico previously well moistened. 



Tannin and bablah.* — The application of these dyes is 

 the same as that of the nutgalls. In this case, the clear 

 solution of the tannin should only be employed for dyeing, 

 otherwise spots remain when the cloth is dipped in the 

 solution of iron alum. The properties of the cloth are the 

 same as those given under dyeing with nutgall and iron 

 alum. Specimens dyed with these colours exhibit strik- 

 ingly what is meant by dyeing of one colour, or going 

 into the ground. It proceeds from the colouring matter 



* I am not sure of the mennino- of tliis word. — Trans. 



