154 ADHESIVES. [V. 



Brilliant Lacquer for Paper and Papier-mache. — 3 oz. 

 powdered sandarac are digested on a sand-bath in 12 oz. al- 

 cohol, 2 oz. elemi-resin added, previously fused in an earthen 

 pot, and the whole digested until dissolved. This lacquer is 

 brilliant, and rather durable. A good lacquer for colors is 3 

 oz. sandarac, 2 oz. mastic, 2 oz. pounded glass, 1|^ oz. Venice 

 terpentine, and lib alcohol. After solution, the varnish is 

 filtered through felt. It may be colored red by anotto, dra- 

 gon's blood, or red-wood, yellow by gamboge or turmeric, and 

 green by buckthorn berries. (Polytech. Notizbl.) 



Oil Varnish. — Liebig's method of preparing a good varnish 

 is as follows. 1ft) acetate of lead, lib litharge, and 5 pints 

 water are digested together until the reddish color of the 

 litharge has become white, from the formation of \ acetate 

 of lead, and filtered. 20ib linseed oil, containing lib litharge, 

 is added to the filtrate, exposed to the sun, and frequently 

 shaken, until the varnish has become wine-yellow and clear, 

 when it is filtered through cotton. It dries rapidly. An 

 analogous method for poppy-seed oil prescribes 4 oz. oil, 2 oz. 

 litharge, and 2 pints water, and directs that the liquid should 

 be poured off, 8 oz. of the oil poured on the white basic ace- 

 tate remaining, and exposed to the sun until it has become 

 colorless. 



Varnish for Patent Leather. — The process followed in 

 France for glazing leather is to work into the skin, with ap- 

 propriate tools, three or four successive coatings of drying 

 varnish made by boiling linseed oil with white lead and litharge, 

 in the proportion of one pound of each of the latter to one 

 gallon of the former, and adding a portion of chalk or ochre. 

 Each coating must be thoroughly dried before the application 

 of the next. Ivory-black is then substituted for the chalk or 

 ochre, the varnish slightly thinned with spirits of terpentine, 

 and five additional applications made in the same manner as 

 before, except that it is put on thin and without being worked 

 in. The leather is rubbed down with pummice-stone powder 

 and then varnished and placed in a room at 90°, out of the 

 way of dust. 



