L. TECHNOLOGY. 489 



paper retains all its qualities, even after being wetted several 

 times in succession, while paper prepared in the usual manner 

 loses, to a great extent, its pliancy, and becomes hard and 

 stiff. 17 A, September 1,139. 



RED AND VIOLET FUCHSIN VARNISH FOR PRINTING. 



Mr. A. Miiller recently instituted a series of experiments for 

 the preparation of a red and violet fuchsin varnish, suitable 

 for printing woven fabrics. His process, which has proved 

 entirely successful, consists in mixing an alcoholic solution 

 of gum shellac with a like solution of fuchsin, and exposing 

 the mixture to different temperatures in a vapor bath. The 

 color changes with the temperature from rose, amaranth, red- 

 dish violet, and pure violet to blue, and can be rendered per- 

 manent at any step in the operation. The varnish thus ob- 

 tained, when properly diluted with alcohol, is ready for print- 

 ing. The color is fastened in a simple manner, not as yet 

 disclosed ; after which it resists the influence of boiling water 

 and hot solutions of soda and soap, and is not easily affected 

 by light. 5 C, 1871,95. 



ACIDIFICATION OF ALCOHOL BY LTCOPODIUM. 



It is said that if alcohol is digested with the seeds of the 

 club-moss, or Lycopodium, it will soon show an acid reaction, 

 due to the development of vinegar. 1 C, ill, 48.* 



DETECTION OF LOGWOOD DYE IN WINE. 



To detect logwood in wine it is only necessary, according 

 to the Journal de Pharmacie, to place strips of good filtering 

 paper in an aqueous solution of neutral acetate of copper, 

 and then dry them. Wine suspeeted of coloration with log- 

 wood may be tested by dipping a slip of the prepared paper 

 into it, and, after removal, allowing the adhering drop of wine 

 to flow backward and forward over the paper, which is to be 

 rapidly dried. If the wine be pure, the color exhibited after 

 drying will be gray or rose-red grayish, but if logwood be pres- 

 ent the tint will be distinctly sky blue. 5 A, July, 1870, 307. 



ALBUMEN CHARCOAL. 



A Yjreparation called albumen charcoal has been devised 

 for the purpose of clarifying sugar sirups, and for which it is 



X2 



