Porcelain slip from which dolls are made is a liquid about the consistency of yogurt or heavy cream.  Once poured in the plaster type mold, the porcelain sets up within minutes, forming a coating on the inside of the mold.  Temperature and humidity determine the time required for the depth of the coating to be correct, generally the thickness of a nickel.  The excess is poured out of the mold and the casting is allowed to set inside the mold approximately one hour, depending on weather conditions.  Doll makers avoid pouring porcelain in rainy or damp weather.  When the cast is ready, the mold will open easily, and the cast is firm enough to be removed carefully from the mold.  The body parts of the doll: head, arms legs, shoulder plate or body are then allowed to air dry 24 to 48 hours.  At this point the castings are called "greenware".