217 [ 175 ] 



tlon of tin, and three quarters of an ounce of indigo, which has been 

 previously dissolved in three ounces of oil of vitriol, and stir the 

 whole well. Immerse the siik colored blue in the cochineal liquor, 

 work it well therein until the liquor begins to boil, let it boil another 

 hour, during which time the silk must however be continually work- 

 ed: it must then be taken out, rinsed, wrung, and dried. 



If you desire this Turkish blue to incline more to a red, increasp. 

 the quantity of the cochineal; if the contrary, take less; 



A handsome Green. 



Take 2 lbs. of alum, and 



4 lbs. of quercitron bark. 



Dissolve in a kettle, with eight buckets of water, two pounds of 

 alum; then pour it into a tub, and set it by until wanted. 



While engaged in preparing the above solution, the silk must be 

 colored in a cold keep to a handsome light blue, and, after being rinsed 

 in a stream, wring and steep it in the above-mentioned alum liquor- 

 work it well therein for two hours, then take it out, wring, and lay it 

 by, wet, for further use. 



Lastly: put four pounds of quercitron bark in a kettle with eight 

 buckets of water, boil it well for the space of three quarters of an hour, 

 and pour the liquor through a sieve into a tub. 



At the same time, and while tliis is doing, prepare an incorporation 

 of indigo and oil of vitriol,* and pour tlie same into the quercitron 

 liquor in the tub, and stir the wliole well. Steep the silk in this com- 

 pounded liquor, and work it well therein for the space of half an hour; 

 then take it out, wring and dry it. 



In case the silk has not attained as handsome a green as desired, add 

 a small quantity of turmeric to the yellow liquor, which will assuredly 

 have the desired effect. 



At the same time I would recommend not to color the silk too dark 

 in the cold keep, as it is very difficult to produce a handsome green 

 on a ground which has been spoiled by keeping it in the dark. It is 

 therefore more adviseable to have it of too light a color, as you may, 

 in that case, easily regulate the color by adding more of the prepara- 

 tion of indigo to the yellow liquor, as circumstances may require. 



Best Blue J (ultra Marine. J 



The quantity of the necessary ingredients for this color, must be 

 regulated according to the quantity of silk to be colored. 



Take fdings of copper, free from all alloy of other metals; it is 

 best, therefore, to rasp or file them yourself, in order to obtain them 

 pure. Put these into a glass vessel, pour spirits of salt, [muriatic 

 acid] sufficient to cover them twice as deep as the spacT; they occupy; 

 let them stand for the space of twenty-four hours, or as long as neces- 

 sary for the spirits of salt to attain a blue or deep green color. 



Then pour off the clear part of the colored spirits of salt into an- 



• The proportions are nine or ten parts of the stronc;- acid, to one of indigo, at a 

 temperature of 100° to 112^ of Falirenlieit's thermometer. — Editoii. 

 2S 



