An armature is the critical first step and forms the basis to support the clay. The wire structure will reflect the finished product. The clay is applied in layers reflecting the musculature and motion. Depending on the piece and the detail required I may initially sculpt a piece in wax. Several types of wax are available in varying degrees of hardness. A harder wax should be used for finer carving.
Using the clay sculpture a mold is made by painting on a polyurethane or silicone rubber that solidifies. This is then used to pour a wax mold. The wax is then chased and sprued. The latter forms channels for which the bronze can travel into the artwork. Chasing refers to the process of removing imperfections. An investment or hard shell is then made of the wax. The investment is typically made of sand, silica, and water; the investment is used for the pouring of the hot molten bronze whereby the wax is lost. The final step is selecting a patina and mounting the sculpture on the appropriate base. Patination is a complex process of applying heat and brushing on chemicals to create the desired color and effect.
For further details of the creative process, please see the foundry’s website at www.americanbronze.com.
