Seven working definitions

Glossary.

01Life cast
A mold taken from a living person’s head or face and used to make a positive form for sculpting or prosthetic work.
02Foam master
A durable positive copy of a head form used as a base for later sculpting; the federal record describes Don Post Studios as owning one of Shatner’s head.
03Retail mask
A mass-produced mask sold to the public, as distinct from a one-off production prop.
04Hero mask
The principal mask used for close or important photography; the term distinguishes it from reported stunt copies.
05Screen-used
An object documented as having appeared during filming, not merely the same model or a later replica.
06Provenance
The documented chain of ownership or custody used to support an object’s identity and history.
07Claim grade
This site’s visible label for how well a statement is supported: established, reported, disputed, or myth.