ON COLORING. 57 



ter, and dip the stuffs till they acquire the color desired. More 

 of the liquid must be added when the water becomes nearly 

 clear before the stuffs have acquired a color sufficiently deep. 



YELLOW. 



There are a great number of imported and native plants, roots 

 and barks, that by the aid of the mordants alum and tin, dye yel- 

 low. But the very best of all these, viz. the yellow oak bark, 

 or quercitron bark, as it has been named in England, being very 

 plenty in this county, it seems altogether unnecessary even to 

 mention any other. 



To dye 10 lbs weight of cloth, or woollen stuffs, of the high- 

 est and most beautiful orange yellow, 1 lb. of quercitron bark, 

 and the same weight of murio sulphate of tin, will be required* ; 

 the bark powdered and tied up in a bag of thin cotton or linen 

 cloth, may be first put into the dyeing vessel, which of course 

 must bo brass, copper, glass or earthen, with hot water, for the 

 space of six or eight minutes; then the murio-sulphate of tin 

 may be added, and the mixture well stirred two or three min- 

 utes. The cloth, previously wet thoroughly with warm water, 

 may be put in and turned briskly a few minutes ; the color ap- 

 plies itself in this way so equally to the cloth, and so quickly, 

 that after the liquor begins to boil the highest yellow may be 

 produced in less than fifteen minutes, without any danger of its 

 proving uneven. f 



When a bright golden yellow, approaching less to the orange, 

 is wanted, four ounces of the murio-sulphate of tin, and two 



* Murio-sulphate of tin. Tliis preparation tlilTiirs somewhat from the muriate of tin, or 

 nitro-muriato of tin, the method of preparing which is given in a preceding part of tLis essay. 

 It is prepared as follows ; Take six ounces of muriatic acid, and pour it upon about the same 

 weight of tin, granulated as above directed, in a glass vessel. Then pour slowly upon the 

 same four ounees of sulphuric acid, and let it stand in a warm place till tho acids satuiato 

 themselves with tin, that is, till they will dissolve no more, which will be soon eflecled, if 

 heat be applie(', and gradually without being heated. 



t Should a deeper orange tint be desirable, add to the quercitron bark a little madder per- 

 haps an ounce or loss to the pound of bark, according to the color desired. This will greatly 

 increase the beauty of the color, when examined by candle-light. 



