My process

       The technique of glass casting using the lost wax method is very similar to the lost wax process of casting bronze and other precious metals. I typically sculpt the object in oil based clay and create a silicon mold surrounded by a plaster mother mold to support the soft silicone rubber.  I then pour the wax into this mold, clean it up (or chase it,) and create a one time plaster/silica investment mold which can withstand the high temperatures of the kiln firing, over the wax image. The wax is then melted out, leaving a cavity in the exact shape of the pattern within the plaster/silica investment mold. The high fire plaster investment mold is then placed into the kiln so that the glass chunks can flow from a reservoir into the mold when the kiln temperature reaches the melting point of glass.  (Top left and right photo)​​

     The critical stage of the process occurs as the glass cools and the molecules bond together and anneals the glass which prevents possible breakage in the future. This annealing takes days if not weeks depending on size of the sculpture. Once the piece is cold, the object can then be divested from the mold and cold worked to create the desired finish. (bottom left and right photo)

     Since my studies in the Czech Republic, I have started making one time clay objects and then making a high fire investment mold from the clay objects instead of wax objects. Whether I will continue this technique, only time will tell.