This is another example of a mold for making a sulphide. Sulphides are a ceramic base that is fired to hardness, and then encased in glass. Care must be taken to ensure that the glass and the ceramic have a compatible expansion coefficient.

This ST CLAIR Mold used for making SULPHIDE Paperweights is a common plaster base press mold. Note that the cavities are relatively shallow.The sulphides of this type were genereally laid over a ground (colored base) and then clear glass was encased around them.

RELIGIOUS THEMES

Difficult to see - but this is a Pearl Harbor Commemorative - of the Battleship Arizona.

John F. Kenney press mold

letters used for custom lettering work

ABOUT St Clair Paperweights: St Clair is a well-known Indiana glass house. Joe St. Clair's immigrant father originally worked for Indiana Tumbler Company which became Greentown. When the company went out of business, the St. Clairs bought some of the molds. Around 1936 Joe built his own glass shop, and began reproducing Greentown-like glass, and paper weights.
Joe signed his weights "Joe St. Clair." (indented into the glass on the bottom with printed letters, not an actual signature.) Pieces signed "St. Clair"are later pieces, most likely made by one of his sons. The St. Clair factory still exists and is producing paperweights and lamps in Elwood, Indiana. There is a very good website about the St. Clair glass at this link The House of Glass

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