Casts 



5i 



wax onlv complicates the matter and means nothing. Many 

 workers with wax add substances such as whiting, talc, and 

 plaster of Paris to the wax. Why? I don't know. These sub- 

 stances onlv act as fillers and accomplish nothing except to 

 change the color of the composition. Also, when a filler such as 

 whiting is added in excessive quantity, the resulting composition 

 becomes brittle and may even crumble. Stav with the simple 

 formula found in Chapter 12. Fillers are justified when certain 

 effects such as metal, stone, and wood are desired. The angler 



Fig. 48. Piranha cast in wax. 



may find it interesting to experiment by adding powdered glass, 

 marble meal, or metallic powders such as copper, silver, or gold. 

 Two methods can be used in applying the wax composition 

 to the mold— brushing or pouring. If the mold is fairly small and 

 has been heated in hot water, pouring wax into the mold will 

 be satisfactory. Brushing the wax into the mold, however, has 

 many advantages. The mold does not have to be lifted and 

 tilted back and forth in an attempt to place the wax in the same 

 thickness over the entire mold. There is less chance of border 

 lines forming as the wax cools during the process of tilting the 



