58 ON COLORING. 



ounces of alum, and one pound of bark, managed in the same 

 manner as above directed. Pure bright yellows, of less body, 

 may be colored by employing smaller portions of the articles 

 above mentioned. 



A good yellow may also be produced by boiling the cloth for 

 one hour in one seventh of its weight of alum dissolved in a 

 suitable quantity of water, and then, without being rinsed, put 

 it into a dyeing vessel with clean hot water, and about as much 

 quercitron bark tied up in a bag, as was used of ahun. Boil and 

 turn it as usual, until it takes sufficient color, then dip it in warm 

 lime water for ten minutes, and rinse it well immediately after- 

 wards. Tin, however dissolved, when used in coloring wool or 

 silk, renders the fibres a little harsh, but this may be in a great 

 measore obviated by employing the murio sulphate of tin with 

 a mixture of alum, or alum and tartar, and combining these with 

 the coloring particles of the bark before they are applied to the 

 stuffs. 



In dyeing silks, more alum and less tin should be used than 

 is directed for woolens, because tin, unless used sparingly, al- 

 ways diminishes the glossiness of the silk. 



To produce a lively yellow on silks, it will be sufficient to 

 boil after the rate of four ounces of bark, three ounces of alum, 

 and two ounces of the murio sulphate of tin, with a suitable 

 quantity of water, for ten or fifteen minutes, and the heat of the 

 liquor being reduced so that the hand can bear it, the silk is to 

 be put in and dyed, as usual, taking care to agitate the liquor 

 continually, that the coloring matter may not subside, until it 

 has acquired the proper shade. By adding very small propor- 

 tions of cochineal to the bark, the color may be raised to a 

 beautiful orange, or even aurora. A similar effect, though less 

 brilliant and beautiful, is prodaced by adding madder to the 

 quercitron. 



A YELLOW ON COTTON AND LINEN. 



It has been said that the fibres of cotton and linen have not 

 SO strong an affinity for clay and tin as those of wool and silk. 

 A somewhat different management, therefore, becomes necessa- 



