The document provides steps for duplicating dental molds, preparing refractory casts, waxing patterns, spruing patterns, and investing patterns. It includes: 1. Melt duplicating material and soak master cast before securing it in the duplicating flask with wax or clay. Pour duplicating material until vent holes are plugged. 2. Trim and dry refractory casts before dipping in beeswax to prepare for wax patterns. 3. Attach sprues to thick areas of wax patterns and attach to crucible former before investing in plaster-bound silicate material inside a metal ring.