Green-yellow from Alumina, Iron Mordant, ^c. 205 



Tin mordant. No. 1, printed upon it, forms a clear dark 

 yellow. 



Tin mordant. No. 2, forms a clear light yellow. 



Solution of chloride of lime produces a slight brownness. 



With these mordants an infinite number of shades may 

 be produced, partly by altering the proportions of iron to 

 the alumina, or vice versa, and partly by employing other 

 colouring matters^ besides madder and quercitron. Galls, 

 tannin, oak and willow bark, especially, give clear colours. 



GREEN-YELLOW FROM ALUMINA, IRON MORDANT, AND 

 QUERCITRON. 



A light shade is produced by immersing the cloth in 

 alum mordant No. 3; pressing it ; and then, before drying, 

 rinsing it ; and then treating it in the same manner with a 

 solution of iron alum. 



A dark colour is communicated to the calico mordanted 

 with alum mordant No. 1. After being allowed to hang- 

 several days and well washed, it should then be impreg- 

 nated with iron mordant No. 2; pressed and then pro- 

 perly washed before drying. ^ 



A light colour is produced by 4 lbs. quercitron powder 

 to 24 lbs. mordanted cloth. A deep yellow tinge by 8 lbs. 

 quercitron powder and 24 lbs. mordanted cloth. 



No lime should be added to the solution, and the dyeing 

 should be performed at a boiling temperature. 



Hot soap-suds do not improve this colour. On the 

 contrary, when passed through a mixture of 20 lbs. strong 

 vinegar and 200 lbs. water, it acquires an agreeable green 

 shade. 



Properties of Quercitron Yellow- Green. — By boiling for 10 

 minutes with soap-suds the greenish-yellow colour alters, 

 and is converted into a gray of the same depth. 



Solution of potash produces brown spots which vinegar 

 removes. 



Lime-water shews some action, when a drop is placed 

 upon the cloth which acquires a brown colour. 



Ammonia makes the colour brownish. 



Vinegar makes green spots. 



Lime-juice forms yellowish white spots which are not 

 completely removed by ammonia. 



