Showcased here is an unpainted Cyborg hardcopy head from the 3rd series line. The piece is cast in a grey resin. While this color of resin is not nearly as abundant as the green dyncast, I have seen it used on a few 3rd series prototypes.
Hardcopies are produced using a silicone mold (this mold is created from the orginal wax figure sculpting). Once it is removed from the mold it may serve a number of purposes. It might remain unpainted and ultimately used to create the steel tooling for the figures. Extra hardcopies are poured as a precaution, should something happen to the tooling master. These extras would remain unpainted as well. If a hardcopy is not destined for tooling or backup, then it will more than likely be handpainted for use in catalog photography, trade shows, or as a paintmaster. Most paintmasters for the Super Powers line are cast in milky white proto plastic (commonly referred to as internal first shots), but I have seen dynacast paintmasters.