SCHWEINFURTH GREEN 



755 



the kettle, a little cold water is to be added. When the bath has become uniform, the 

 cloth is to be put in, taking care to \rince it briskly for two or three turns; then to 

 boil it bodily for an hour, thrusting it under the liquor with a rod whenever it rises to 

 the surface. It is lastly taken out, aired, washed at the river, and dried. 



Below will be found the tables of the composition of the bouillon and the rougie. 



M. Lenormand stated that he had made experiments of verification upon all the 

 formulae of the following tables, and declared his conviction that the finest tint might 

 be obtained by taking the bouillon of Scheffer and the rougie No. 4 of Poerner 



Table* of the Composition of the Bouillon and Bougie for 100 pounds of Cloth or Wool. 

 Composition of the Bouillon. 



Composition of the Bougie. 



M. Kobiquet has given the following prescription for making a printing scarlet, for 

 well-whitened woollen cloth : Boil a pound of pulverised cochineal in 4 pints of 

 water down to 2 pints, and pass the decoction through a sieve. Repeat the boiling 

 three times upon the residuum, mix the 8 pints of decoction, thicken them properly 

 with 2 pounds of starch, and boil into a paste. Let it cool down to 104 Fahr., then 

 add 4 ounces of the solution of tin and 2 ounces of ordinary muriate of tin. When 

 a ponceau red is wanted, 2 ounces of pounded tumeric should be added. 



A solution of chlorate of potash is said to beautify scarlet cloth in a remarkable 

 manner. For several fine scarlet dyes, see ' Practical Handbook of Dyeing,' by Wm. 

 Crookes, F.K.S. See LAC DYE ; ANILINE ; MUBEXIDE. 



SCHEELE'S GREEN is a pulverulent arsenite of copper, which may be prepared 

 as follows: Form, first, an arsenite of potash, by adding gradually 11 ounces of 

 arsenious acid to 2 pounds of carbonate of potash, dissolved in 10 pounds of boiling 

 water ; next, dissolve 2 pounds of crystallised sulphate of copper in 30 pounds of 

 water ; filter each solution, then pour the first progressively into the second, as long as 

 it produces a rich grass-green precipitate. This being thrown upon a filter-cloth, and 

 edulcorated with warm water, will afford 1 pound 6 ounces of this beautiful pigment. 

 It consists of, oxide of copper, 28'51, and of arsenious acid, 71 '46. This green is 

 applied by an analogous double decomposition to cloth. See CALico-PniNTiNa. 

 Much discussion has arisen relative to the use of this salt in paper-hangings, it having 

 been supposed by many persons to have produced ill effects on those exposed to the 

 atmosphere of such rooms. 



SCHMEIiZE. A kind of glass prepared in Bohemia, chiefly for the purpose of 

 receiving the red colour imparted by the oxide of gold. See GLASS. 



SCHWEinFURTH GREEN* is a more beautiful and velvety pigment than the 

 Scheele's green. It was discovered in 1814, by MM. Eusz and Sattler, at Schwein- 

 furth, and remained for many years a profitable secret in their hands. M. Licbig having 

 made its composition known in 1822, it has since been prepared in a great many 

 colour-works. Braconnot published, about the same time, another process for manu- 



3 c2 



