184 OF VIOLET PURPLE DYES. 



cles of this kind of very high price. I bad proofs of this two 

 In 1775, rich and thirty years ago, when I lived at Rouen ; for having then 



prints sold at „ r • ,. . ,, ,, . , ,, 



Kouen for gown pieces ol ten ells, or a very rich pattern, to sell on 



XI 13 6 a commission, I disposed of them without difficulty at two and 



thirty louis a piece. These articles were from the manufac- 



Mr.von Schule tor y cf the illustrious John Henry von Schule, of Augsburg, 



the first manu- who is well and justly entitled to be styled illustrious, as the 



facturer of ~ , P * , . ,-, i " • , , 



printed goods nrst manufacturer in Jburope, who carried the printing of 



in Europe. calicoes to great perfection and extreme beauty. His arti- 

 cles have made so much noise in all parts of the mercantile 

 world, that the emperor of China desired to see them, and 

 admired them in comparison with the productions of his own 

 dominions. 



Cottons intended to be printed with violet purple grounds, 



Cottons must anc * to ^ ave au " wm ^ e figures, require to be very well 



be well bleached, that they may be muddied as little as possible in 



bleached. dyeing: for, though the violet purple is such a fixed colour, 



as to support the action of the alciiliue lixivium of oxigenized 



muriate of potash,without being much weakened, the white is 



restored but slowly. 



Alumine fixed in the cloth, and saturated with the colour- 

 may be dyed ' n o particles of tincture of alkanet, will still admit the colour- 

 upon the alka- ing matter of other vegetable or animal substances; which 

 Tar* the h*u »* ves nse to an infinite number of other tints, that may be in- 

 creased indefinitely, by more or less diluting the acetate of 

 alumine employed in the printing; and by dipping the violet 

 purples, and their derivative tints, thus produced, in a bath 

 of madder, cochineal, kermes, brazil, weld, quercitron, &c. 

 By mixing these drugs in different proportions, the tints may 

 be greatly increased in number ; and still farther by mixing 

 more or less acetate of iron with the concentrated or diluted 

 solution of acetate of alumine. 



Cotton printed with oxide of iron, or a concentrated solution 



Alkanet with f ace t a te of iron, takes a greenish black from the tincture of 

 oxide of iron. ■ . ° . 



alkanet: and by diluting the solution oi acetate or iron in 



different proportions, we shall obtain a great variety of grays, 



more or less deep, and more or less green. These tints are 



equally susceptible of variation by means of the dyeing drugs 



Other colours alread >' mentioned. 



primed by the If we wish to produce other colours by the side of the 



side of ih ground 



