L. TECHNOLOGY. 515 



cult of ignition, and are not absolutely innocuous, but only 

 less poisonous than the others. They absorb moisture more 

 readily, which renders them still more difficult of ignition in 

 damp seasons and localities. To the maker, they are less 

 satisfactory, as requiring much more care and expense in se- 

 curing a uniformly successful result. Dr. Jettel therefore 

 comes to the conclusion that a safe and harmless friction 

 match, to contain no phosphorus, and to be equally service- 

 able with the phosphorus matches, is yet to be invented. 

 6 C June 1,214. 



ZINC GREEN. 



An excellent quality of zinc green, it is said, can be pre- 

 pared by stirring into a sufficient quantity of water five parts 

 of oxide of zinc nd one part of dry sulphate of cobalt. The 

 solution is then to be dried and exposed to a red heat, which 

 results in the production of a dark green powder. If we use 

 ten parts of the oxide of zinc and one part of the salt of co- 

 balt, the product is a dark grass-green color ; with twice the 

 percentage of the oxide of zinc it becomes a light grass green. 

 Of the different tints the light grass green is the most esteem- 

 ed, since it is well adapted to replace the dangerous Schwein- 

 furt or arsenic green, and because it takes a good hold upon 

 whitewash, which is not the case with the green cinnabar 

 prepared by mixing together Berlin blue and chrome yellow. 

 5 (7, xiv., 112. 



FUSCIN, A NEW BROWN. 



Fuscin, a new brown for dyeing wool and cotton, discover- 

 ed by a Belgian colorist, is presented as likely to prove a per- 

 manent addition to the resources of the dyer, since its claims 

 to regard are based not only on its being excellent in itself, 

 but also procurable at a very low price. In using it 1200 

 grammes of fuscin, 1000 of water, and 1200 of hydrochloric 

 acid, of 18 to 20, are to be mixed together, with the addi- 

 tion of a few hundred more grammes of water if necessary. 

 After the mixture has stood for half an hour, twenty-two 

 litres of hot water are to be added, and the whole well stir- 

 red and decanted, and the liquid solution kept for use. 



For coloring ten kilogrammes of wool there are to be used 

 eighteen litres of the above solution, two kilogrammes of sul- 



