L. TECHNOLOGY. 439 



potassium in eighteen parts of water constitute an excellent 

 material for bleaching wool or cotton. When used it is to 

 be diluted with fifty times its bulk of water. 6 C, August 10, 

 xxxii., 318. 



DYEING COTTON W T ITH ANILINE. 



According to a Bavarian patent, aniline colors can be thor- 

 oughly fastened upon cotton fabrics in the following manner: 

 A solution of 3 lbs. of sugar of lead in 24 lbs. of water is 

 mixed with a solution of 3 lbs. of potash in the same quantity 

 of water, to which is added another solution of 6 lbs. of alum 

 in 40 lbs. of water, which serves as a mordant. The yarn, 

 etc., is left for 12 hours in this solution, and then, having 

 been well wrung, is placed for one hour in a bath of chloride 

 of tin. When rinsed in pure water and wrung, it is ready 

 for the dyeing proper, which is conducted in a cold bath, to 

 which 3 oz. of aniline red, previously dissolved in 6 lbs. of 

 strong alcohol, is added. The bath is then heated to boiling, 

 which is continued for some minutes, when the goods are to 

 be rinsed and dried. 5 C, xv., 120. 



DYEING WOOD OF DIFFERENT SHADES OF ANILINE EED. 



Mr. Stubenranch, of Furth, informs us that any woods nat- 

 urally white, such as maple, linden, etc., can be easily dyed 

 red, of varied and brilliant hues, by means of some of the an- 

 iline preparations, as corolin, rosein, etc. The wood is first 

 soaked in or washed with Marseilles soap, after which a di- 

 lute alcoholic solution of the aniline color is applied, which 

 may be repeated until the desired shade is produced. If the 

 wood is impregnated with any pigment, it should be first 

 bleached. For this purpose it is placed, for about half an 

 hour, in a bath of chloride of lime and soda ; a bath of dilute 

 sulphurous acid may then be used to remove the chlorine. 

 A thorough washing in pure water after this should precede 

 the dyeing treatment. 5 (7,1871,111. 



DYEING EED ON WOOL. 



For dyeing ponceau-red upon Caxton wool, the German 

 Dyers' Gazette gives the following recipe : two pounds of 

 powdered lac dye and one pound of powdered cochineal are 

 mixed with eight ounces of bichloride of tin and hot water into 



