SSC Cast Iron Glossary

A reference guide for collectors, researchers, and restorers. Terms used throughout the SSC museum documentation are defined here.

Archival Black™ The SSC museum-standard conservation finish. Achieved through lye degreasing, electrolysis, and hand finishing only. No grinding, sanding, or metal loss.

Assist Handle A small secondary handle opposite the main handle, used for two-handed lifting of heavy pieces. Also called a helper handle.

Bail Handle A wire or iron loop handle, typically found on kettles, Dutch ovens, and camp cookware.

Casting Flash A thin line of excess metal left at the mold seam during casting. Visible on older pieces and considered part of the original casting evidence.

Catalog Number A foundry-issued model number cast into the base of a piece. Wagner adopted a four-digit catalog numbering system around 1924.

Gate Mark A raised ridge or scar on the base of a casting, left where molten iron entered the sand mold. Gate marks are characteristic of pre-1890s American foundry production and are among the oldest identifiable casting features.

Ghost Mark A faint remnant of earlier lettering or logo visible on a piece — typically the result of a reused or recut mold. Not to be confused with casting flash.

Heat Ring A raised circular ridge around the base perimeter of older skillets and pans, designed to seat the piece securely over a wood or coal stove eye. Absent on smooth-bottom pieces produced after approximately 1935.

Hollow Ware The foundry trade term for cast iron vessels — pots, kettles, Dutch ovens, and similar pieces — as distinct from flat cookware like skillets and griddles.

Inset Heat Ring A heat ring set recessed into the base rather than raised above it. Less common than the standard raised configuration.

Logo Era The period of a foundry's production during which a specific trademark was in use. Used in SSC documentation to date pieces by mark configuration — e.g., Wagner arc logo era (c. 1891–1914), stylized logo era (c. 1922–1959).

Machined Finish A smooth interior cooking surface achieved through factory milling after casting. A characteristic of high-quality vintage iron from Wagner, Griswold, and comparable foundries.

Molder's Mark A small dot, letter, or symbol pressed into the sand mold by an individual foundry worker to identify their work for piecework payment purposes.

NRA Mark A National Recovery Administration eagle stamp found on cookware produced during 1933–1935, indicating compliance with New Deal labor standards. A useful dating marker.

Pattern Letter A letter cast into the base identifying the specific sand mold pattern used. As molds wore out and were replaced, the pattern letter advanced — A, B, C, and so on. Used in SSC documentation as a relative production sequence indicator.

Pitting Surface cratering caused by rust damage penetrating the metal. Moderate pitting does not affect function but is documented as part of condition assessment.

Pour Spout A V-shaped lip cast into the rim of a skillet or pan to facilitate pouring liquids. Typically found in pairs on opposite sides.

Seasoning The polymerized oil layer built up through repeated cooking use that protects cast iron from rust and provides a non-stick cooking surface.

Size Number The traditional foundry sizing system for skillets and pans, corresponding to stove eye diameter in inches rather than the actual diameter of the piece. A No. 8 skillet fits an 8-inch stove eye.

Smooth Bottom A skillet or pan with a flat base and no heat ring. Characteristic of production after approximately 1935, when gas and electric ranges made the heat ring obsolete.

Spider A skillet or pot with short cast legs, designed to stand over open coals in a hearth. The spider form predates the flat-bottomed stovetop skillet.

Spinner A skillet that rotates when placed on a flat surface due to base warping. A defect that affects both cooking performance and collector value.

Stove Eye The circular burner opening on a wood or coal stove. Skillet size numbers correspond to stove eye diameter.

Swirl Mark Circular machining marks on the interior cooking surface left by the factory milling process. Visible on high-quality pieces and considered evidence of original machining — not a defect.

Unmarked Ware Cast iron produced without foundry branding, typically for private label retailers or as lower-cost trade goods. Attribution of unmarked ware requires physical evidence — handle geometry, casting character, heat ring profile — rather than markings.

Wobble Unevenness that causes a skillet to rock on a flat surface. Distinct from a spinner — a wobbler rocks, a spinner rotates. Both are condition defects documented in SSC collection records.

This glossary is maintained by Steve's Seasoned Classics as part of the SSC Digital Library. Terms are updated as collection research produces new evidence.