CALICO PRINTING. 401 



HXY 



the design is printed with a 

 paste of tartaric acid upon the 

 colored cloth. On subsequently 

 immersing the goods in a bath 

 of chloride of lime, chlorine is evolved in the tissue, 

 and the color discharged only where the acid is printed. 

 The white thus produced is of course in exact cor- 

 respondence with the printed design. 



Howareyellow 1006 - PANTED YELLOW AND BLUE. To 



and blue de- produce yellows on madder red and purple 



signs obtained ' 



on dyed grounds, before described, tartaric acid is 



grounds t printed with the nitrate of lead, and the 

 cloth immersed in bleaching liquid. The color of the 

 printed portions is discharged by the combined action 

 of the acid and bleaching liquor ; the lead is at the 

 same time fixed in the cloth, as chloride of lead. On 

 subsequent immersion in bichromate of potassa, the 

 yellow figures of ehromate of lead are produced as be- 

 fore. For blues on the same colored grounds, a mix- 

 ture of Prussian blue, dissolved in bichloride of tin, 

 with tartaric acid, is printed on the cloth. The dis- 

 charge of the ground color beneath the figure, is 

 effected, as before, by chloride of lime. 



1007. VARIEGATED PATTERNS. All of 



How are varie- ._ 



gated patterns the madder colors which have been men- 

 produccd ? tioned, may be produced upon a single piece 

 of white goods, by printing the different figures of the 

 pattern with different mordants. This is accomplished 

 by passing the fabric between different sets of rollers, 

 each of which is supplied with a paste of the proper 

 mordant, and so engraved that it yields the desired im- 



