Abstract: A mixing and storage assembly for ceramic materials such as dental porcelain, comprising an open-cell foam pad disposed within a removable micro fine knit fabric sheath. The pad and surrounding sheath are together charged to a mixing and storage vessel which further contains a reservoir of water or other liquid suitable for the preparation of a workable ceramic mix. The assembly is capable of maintaining the proper moisture content of the mix during both use and storage without the frequent need for stirring or water replenishment and without the threat of supersaturation of the mix. Liquid flow from the reservoir to the substrate mix is regulated by the capillary action inherent in the pad which maintains a consistent liquid content for supply to the porcelain powder thereby retarding premature hardening due to moisture loss associated with evaporation.