The indicators of smithing activity include:
SSL - Smithing Slag Lumps, randomly shaped pieces of silicate smithing slag.
HB - Hearth Bottom plano-convex accumulations of smithing slag.
HS - Hammer Scale micro-slag occurring as flake HS indicative of forging, Spheroidal
HS indicative of fire welding.
Stock iron/Bar - bars and rods of stock iron used by the smith to manufacture artefacts
Hone Stones - smoothed stones used to sharpen blades.
Hearth Lining - vitrified clay lining of the hearth, fragments may include the tuyere/blow
Charcoal - fuel used in the smiths hearth
Cinder - high silica slag, often intermediate between slag and clay lining.