204 The Art of Dyeing, 



To form both dark shades — let 10 lbs. of mordanted 

 cloth be used for 10 lbs. Avignon madder. Hot soap-suds 

 gives the colour a more saturated aspect. 



Properties of madder-red hrown. — Boiling for 10 minutes 

 with soap-suds (1 part soap to 500 vrater) gives the dark 

 shades more lustre, and a tendency to purple-red without 

 the depth. 



Solution of potash produces a scarcely appreciable darker 

 colour, which completely disappears by the action of 

 vinegar. 



Lime-water, ammonia, and vinegar produce no action. 



Lime-juice produces yellow-brown spots, which ammonia 

 completely dissolves. 



Tin mordant. No. 1, printed upon it, discharges a splen- 

 dent yellow-red. 



Tin mordant. No. 2, discharges a dull brown-red. 



Solution of chloride of lime produces pink coloured spots. 



YELLOW-BROWN FROM QUERCITRON AND IRON MORDANT 

 CONTAINING ALUMINA. 



This is a lighter colour than that formed by the other 

 mixed mordant. 



After the cloth impregnated with the mordant has been 

 allowed to hang several days, it should be passed through 

 a hot cow-dung bath. The cloth prepared for light yellow- 

 brown should not be treated with cow-dung, but equably 

 dyed after rinsing. 



To form both dark shades, 10 lbs. of mordanted cloth 

 should be used for 4 lbs. of powder of quercitron. The 

 dyeing should be performed by slowly bringing the solution 

 to the boiling point. Lime should not be added to the 

 solution. 



Properties of quercitron yellow-brown. — Boiling for 10 

 minutes with soap-suds removes the yellowish colour, and 

 converts the dye into a saturated brown. 



Solution of potash forms dark brown spots, which vinegar 

 does not completely destroy. 



Lime-water renders it brownish, which vinegar removes. 



Vinegar gives the colour more of a greenish shade. 



Lime-juice discharges it white. Ammonia restores the 

 colour. 



