Molten wax is poured into the mold and then the interior walls of the mold are coated evenly.
Three or more layers of wax are carefully given till get consistent thickness. Once the wax become solid again the hollow copy is removed from the mold. This is the second positive. Wax is closely supervised and any noticeable flaw corrected. In addition some texture or special effects may be introduced at this stage.
Each bronze in the edition comes from an individual hollow wax copy cast from the same mold. That means that for a series of 20 bronzes, 20 wax positives must be prepared.