488 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



A NEW AND DURABLE INK. 



According to Bottger, a rapid-drying, brilliant ink, which 

 resists tolerably well the most powerful chemical reagents, 

 may be made by triturating carmine with some solution of 

 water-glass in a porcelain mortar, and diluting with water- 

 glass solution until it flows readily. 8 C, August 14,1873, 

 269. 



IMPROVED COPYING-INK. 



According to the Revue Horticole, an ink, invented by Mr. 

 Cisley, which possesses the property of giving a copy with- 

 out dampening the paper or the use of a press, is prepared as 

 follows: About sixty grammes of any ordinary ink are placed 

 in a bottle, and half its weight of sugar-candy, and four or 

 five drops of gum arabic dissolved in water, added. A letter 

 written with this ink should be placed under a sheet of 

 copying-paper, and the hands passed over it, when a per- 

 fect impression will be obtained in a moment. If the copy 

 do not take well, it is necessary to increase the quantity of 

 sugar, but not of the gum. It is, of course, better to use a 

 regular press, as this gives a more even impression, but the 

 application of the hand or of a paper-folder is sufficient. It 

 is not necessary to moisten the copying-paper, as in the or- 

 dinary method. The copy must be made within a short time 

 after the letter or manuscript is written not to exceed an 

 hour at most. Revue Ilorticole, May 16, 1 8*73, 187. 



PHOTOGRAPHIC MULTIPLICATION OF DRAWINGS, ETC. 



Benneder states that paper prepared as follows costs but 

 about one sixth as much as the ordinary chloride of silver 

 paper, and is as well adapted to the multiplication of draw- 

 ings, and is simpler in its manipulation. A solution of bichro- 

 mate of potash and albumen, or gum, to which carbon, or some 

 pigment of any desired shade, has been added, is brushed, as 

 uniformly as possible, upon well-sized paper, by lamp-light, 

 and the paper dried in the dark. The drawing (or an engrav- 

 ing or wood-cut, etc.), executed on fine transparent paper, is 

 then placed beneath a flat glass upon the prepared paper, and 

 exposed to the light for a length of time dependent upon the 

 intensity of the light. The drawing is removed from the 



