M. TECHNOLOGY. 545 



readily accomplished. In dipping into the ink, it rises and 

 fills the space between the pens, and flows down gradually 

 as wanted in writing. 15 C, xn., 1874, 190. 



GREEN BRONZE FOR IRON. 



A most beautiful and permanent green -bronze coating 

 may be imparted to cast and wrought iron, sheet iron, wire, 

 etc., according to Paul Weiskopf, by a solution of one part 

 of sylinate of silver in twenty parts of oil of lavender. The 

 surface to be bronzed must be well cleaned (not necessarily 

 polished) and dried, and then lightly coated with the liquid 

 by means of a hair pencil, and warmed rapidly up to 302, the 

 proper temperature being readily recognized by the uniform, 

 brilliant, intense green color of all portions. Designs in 

 bronze may be produced by substituting Venetian turpen- 

 tine, or a solution of colophony in oil of lavender, for a por- 

 tion of the oil of lavender, by rubbing the dry sylinate of sil- 

 ver with the resin, and adding oil of lavender to the consist- 

 ency of ordinary paint. Iron articles thus bronzed may sub- 

 sequently be electrically coated with copper, and the latter 

 will not be deposited on the bronzed places. Articles of 

 copper, brass, etc., coated with the above solution and heated 

 to about 482, become covered with a gray, dull film of sil- 

 ver, of a reddish cast, which is not permanent, but after be- 

 ing varnished presents an appearance similar to the so-called 

 oxidized metals. 14 C\ CCXIIL, 1874, 358. 



PAPER IMITATION OF LEATHER. 



A most deceptive imitation of leather is manufactured, ac- 

 cording to a process discovered by Dawidowski, from parch- 

 ment paper. It is as soft and pliable as leather, and resem- 

 bles it perfectly in color and finish, and, like it, can be glued, 

 pressed, stamped, gilded, etc. It therefore forms a perfect 

 substitute for fancy leather for very many purposes. As 

 binding of books it resists abrasion extremely well, and is 

 not affected by dirt or even water. It is also free from the 

 objections to leather as a lining for hats, since it is unaffected 

 by perspiration. 5 C, xxx., 1874, 239. 



