470 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



when it is allowed to run off into tanks. The wadding ab- 

 sorbs all the thick particles contained in the oil when it comes 

 from the mills, and leaves it perfectly clear and tasteless. 

 Oil thus refined is almost exclusively exported to Nice, where 

 it is put into bottles, and sent all over the world as " Huile 

 de Nice." Although we buy this oil in bottles, in Italy it is 

 sold by weight. The total amount of this " Huile de Nice" 

 exported from Oneglia in 18G8 amounted to 121,822 hundred 

 weight. 6 A, August 6, 1 71. 



CLEANING PAINT. 



Soiled paint, whether on wood-work or on canvas, may, it 

 is said, be cleaned perfectly by first dipping a rag in finely 

 powdered and well sifted Spanish white, and then rubbing 

 the surface in question gently with it, thereby removing dust, 

 grease, etc., from the colors. The surface is then to be wash- 

 ed in fresh water by means of a sponge, and rubbed off with 

 a piece of soft chamois leather, and dried. The colors appear 

 as fresh as new, and the whole process is said to have many 

 advantages over the use of soap. 5 (7, xxvn., 216. 



CHLORIDE OF ZINC AS A PAINT. 



Chloride of zinc, which has been used to advantage as a 

 cement, is now highly recommended as a paint. A conven- 

 ient application for this purpose is made by stirring a mix- 

 ture of oxide and chloride of zinc in cream of tartar, adding 

 starch enough to bring it to the proper consistency, and then 

 boiling the whole and allowing it to cool. If the paint is to 

 be colored in any way, a pigment of the desired shade of color 

 is to be introduced before boiling with the starch. In the 

 course of half an hour the paint becomes dry and hard in 

 consequence of the formation of oxychloride, and the drying 

 would be still more rapid if it were not somewhat retarded 

 by the presence of the cream of tartar. This paint does not 

 become darkened in the air, and is without smell ; and even 

 in winter, in consequence of its quick drying, will admit a 

 second and third coat in the space of a few hours. It can be 

 cleaned with soap and water like an oil paint, and its action, 

 in consequence of containing the chloride of zinc, is as a pre- 

 servative of wood, rendering it almost incombustible, a pecul- 

 iarity which can be increased by adding a small quantity of 

 borax. 8 C, September 22, 312. 





