Casting

Substitution method is also called casting and it’s when an artist creates a sculpture from soft substances such as; plastic, molten, wax, or clay and it gets turn into a solid state. The artist can start by making a mold and putting in durable material to get a form.  Most sculptors fill the cast with a molten metal such as bronze and when the metal cools the sculpture it ready.  A method for casting that Sporre talks about is called lost wax, “the artist creates the basic mold by using a wax model, which he or she melts to leave the desired space in the mold” (72). The first step the artist does is creates a wax model of the original sculpture it is then covered with a layer of wax. Wax rods which are gates are attached to the wax casting in the right positions.  This next step is the wax casting is dipped into investment liquid several times, the first dip involves a fine powered which is applied. On the next dip of course, ceramic sand will be applied. This step is repeated several times, each increasing the coarseness of the material to create the ceramic mold. Between each dip, the ceramic layer must dry before another layer can be applied.  As soon as the molten metal has dried the clay can be removed. This video below is about 6 minutes long and it shows a method that Sporre talks about which is Lost Wax.

http://www.youtube.com/watch?feature=player_detailpage&v=uPgEIM-NbhQ#t=6s