I 175 ] 218 



other glass vessel, add iresli spirits of salt to the copper filings, and 

 continue this process until the whole of the copper tilings have been 

 dissolved, when nothing but the earthy and impure parts will remain. 



Mix all these several blue or deep green colored solutions of cop- 

 per, and add thereto as much spirits of ammonia as will be necessary 

 to saturate the mixture. 



Then moisten the silk in warm water; but be careful to do this in 

 such a manner that all parts will be completely and equally soaked; 

 then wring it, and steep it in the blue tincture prepared as above di- 

 rected; work it therein until it has attained a handsome ultra-marine 

 color: then take it out, wring it well, rinse in a stream, and dry it in 

 the shade. 



By minutely observing the above process, you will obtain a very 

 handsome blue color, but which is not altogether lasting, as it will 

 fade by being exposed to the sun, and turn to a greenish tint. 



^Vith the liquor which remains, you may color many other very 

 agreeable blue colors; but you must add, at every coloring, a small 

 quantity of spirits of ammonia to the liquor, as it would otherwise 

 cause the color of the silk died therein, to receive more of a green, 

 jind less of a blue color, at every succeeding coloring. 



c^ dcD'k Blue. 

 Take 1^ ounces of indigo, 

 § lb. of oil of vitriol, 

 14 do. of alum, 

 4 do. of logwood, 

 ^ do. of alum. 



l-he greatest attention and accuracy in the process of dying this 

 -rolor is necessary. 



Before you proceed to the dying itself, prepare a solution of indigo 

 in oil of vitriol, in the manner following: Powder very finely, and 

 aift one and a half ounces of indigo, and put three quarters of a pound 

 of oil of vitriol in a stone jar; add the pulverized indigo to it, stir 

 the whole well with an earthen pipe stem, or some similar earthen ar- 

 ticle, and continue the stirring until the oil of vitriol ceases to ferment; 

 the mixture having become quiet, set it by for the space of twenty- 

 fnur hours; at the expiration of this time, a little water must be add- 

 ed, and tlie whole matter stirred again, by which it will receive, as it 

 were, new life and vigor; after which, it must be set away undisturbed, 

 until it is to be applied to the dying of the silk. After this, prepare a 

 kettle with eight buckets of water, put into it one and a quarter pounds 

 of alum, and dissolve it completely therein. This being done, pour 

 the solution into a vat, steep the silk in the solution, and work it well 

 therein for an hour; after which, take it out, wring, and lay it b}-, 

 wet, for further use. 



Put eight buckets of water in a kettle, pour the solution of indigo 

 into it, and mix it well, work the silk well in this blue liquor for the 

 space of half an hour, then take it out, rinse it in running water, wring 

 and lay it by, wet, for further use. By this process, the silk will re- 

 fceive a handsome light blue color. 



