F12 — Bronze/Iron Smith: Nano Banana Pro Prompt Suite

Phase and Costume Reference

This figure type crosses both Ha C and Ha D. The three prompt variants below are set in Ha D (~620-450 BC), the period for which workshop evidence is strongest (Heuneburg metalworking quarter, Sticna workshop deposits, peak of situla art production). Ha C variants can be produced by substituting Ha C-correct fibula types (Kahnfibel instead of Schlangenfibel) and making the tools more heavily bronze (see investigation.md for phase-specific differences).

Costume baseline (all variants): Non-elite adult male, Western Hallstatt zone (Ha D). Knee-length belted wool tunic in natural brown or dark blue-brown twill weave, fastened at one shoulder with a single simple bronze Schlangenfibel (serpentine fibula). Leather belt with a small bronze hook at the waist. Simple leather shoes of rawhide construction, low-cut, wrapping the foot with visible stitching at the instep. No neck ornament. No arm rings. No gold. Hair short or pulled back; face clean-shaven or with short stubble. Skin weathered and tanned from outdoor forge work. Hands calloused and scarred.

Critical anachronisms to block: No raised masonry forge. No large horn anvil on a tall stand. No double-action bellows with wooden frames. No chimney. No medieval or modern hammer shapes. No checked “Celtic” trousers. No torcs. No La Tene-style ornament. No steel. No coal (charcoal only).

Prompt Variant 1: Standing Smith with Hammer and Tongs at a Forge

Scene Description

A standing/squatting portrait of the smith at his ground-level forge, holding his primary tools. This is the “identity” shot: maximum visibility of the figure, his tools, and the forge setup.

Positive Prompt

A historically accurate reconstruction of a Hallstatt Iron Age blacksmith (~550 BC) at work in a Central European settlement, documentary archaeological illustration style with warm natural lighting. A muscular adult man in his thirties squats on his heels beside a shallow ground-level charcoal forge, a simple pit dug into packed earth lined with clay, filled with glowing orange charcoal embers. He holds a short-hafted iron forging hammer with a flat rectangular head in his right hand, and in his left hand grips a pair of simple iron tongs with flat jaws and long straight reins, the tongs clasping a glowing orange iron bar pulled from the coals. Before him at knee height sits a crude iron anvil block, a rough rectangular slab of dark iron about 20 cm across, embedded in the flat-cut top of a thick oak stump set into the ground. He wears a knee-length belted tunic of coarsely woven dark brown wool in a twill weave with visible diagonal texture, the tunic pulled up and tucked into his belt on one side for freedom of movement, fastened at the left shoulder with a single small bronze serpentine fibula showing the characteristic S-shaped wire bow with spring coil. A wide leather belt with a simple flat bronze hook-clasp cinches his waist. His forearms are bare below rolled-up sleeves, the skin reddened and marked with small burn scars. On his feet are simple low-cut rawhide shoes stitched at the instep with visible leather thong lacing, the leather dark and work-worn. His hair is short and unkempt, his jaw stubbled. Behind him on the ground lie a few spare tools: a second smaller hammer, a bronze chisel, and a clay crucible blackened with use. A pair of simple leather bag bellows connected to a cylindrical clay tuyere pipe lie beside the forge pit, the leather bags deflated between pumps. The setting is an open-sided workshop area within a Hallstatt-period settlement, a rough timber post-and-beam lean-to shelter with a thatched roof sloping to one side, open at the front to allow smoke to escape. Scattered on the packed earth floor are fragments of dark iron slag, wood shavings, and charcoal dust. A woven wicker basket of charcoal sits nearby. Soft diffused daylight mixed with warm orange forge-glow illuminates the scene from the front and below, casting the smith’s face in a mix of cool ambient light and warm reflected firelight. Shallow depth of field, slight film grain, photorealistic rendering.

Negative-Constraint Tail

modern anvil with horn, raised brick forge, stone chimney, coal fuel, double-action wooden bellows, medieval forge design, power hammer, vise, steel tools, shiny polished metal surfaces, clean workshop, concrete floor, modern clothing, checked trousers, tartan, Celtic knotwork decoration, torc neckring, gold jewellery, elaborate fibula, La Tene style ornament, Viking clothing, Roman tools, fantasy armour, leather bracers with buckles, steampunk elements, clean-shaven Hollywood face, muscular bodybuilder physique, dramatic backlighting, lens flare, HDR processing, watermark, text overlay, AI artifacts, extra fingers, deformed hands

Source Annotations

Forge design: ground-level pit, from Dave Budd experimental reconstruction (davebudd.com/IronAgeBlacksmith.html) and Heuneburg workshop evidence (Kurz 2010; corpus: 03_metallurgy.md)
Anvil: low iron block on stump, from Dave Budd experimental work and Pleiner 2006 typology; no Hallstatt-period anvil directly attested (B5_metalworking_tools.md gaps)
Hammer: flat-faced iron forging hammer, Pleiner 2006 (corpus: B5_metalworking_tools.md entry 4)
Tongs: flat-jawed iron tongs, Pleiner 2006; no individual museum photo found (B5_metalworking_tools.md gaps)
Bellows: bag bellows type, Dave Budd experimental (davebudd.com); no preserved Hallstatt bellows exist
Tuyere: clay tuyere, attested from furnace sites (corpus: 03_metallurgy.md)
Costume: standard non-elite Ha D male dress (corpus: A2_costume_reconstruction.md; Gromer 2010; F01 investigation baseline)
Fibula: Schlangenfibel, Ha D1-correct (corpus: A3_fibulae.md)
Belt hook: bronze Gurtelhaken from Hallstatt cemetery (corpus: A4_belt_plates.md, NHM Wien 3D models)
Shoes: rawhide leather shoes from Hallstatt mine (corpus: A7_footwear.md, NHM Wien NHMW-PRAE-89.085)
Settlement context: Heuneburg Aussensiedlung workshop area (corpus: 09_settlement_economy.md; B5_metalworking_tools.md entries 8-12)

Prompt Variant 2: Bronze Sheet-Worker Creating a Situla Using Repoussee Technique

Scene Description

An Eastern Hallstatt zone bronze specialist working on a situla vessel, showing the distinctive repoussee technique from the interior. This variant emphasises the fine craft of sheet-bronze working rather than the brute-force iron forging of Variant 1.

Positive Prompt

A historically accurate reconstruction of a Hallstatt Iron Age bronze artisan (~500 BC) creating a decorated situla vessel using the repoussee technique, southeastern Alpine workshop in the Dolenjska region of modern Slovenia, documentary archaeological illustration style with warm interior lighting. A lean middle-aged man sits cross-legged on a low wooden stool beside a heavy wooden workbench at waist height, concentrating intently on his work. He holds a partially completed bronze situla vessel upside down before him, the bucket-shaped vessel approximately 25 cm tall, made of thin hammered bronze sheet with a warm golden-brown patina showing horizontal guide lines scratched into the surface marking where the decorative friezes will go. His left hand steadies the vessel from the outside, fingers splayed over the partially completed lower frieze where small raised bumps of repoussee decoration are already visible in a row of deer figures pushed outward from within. His right hand holds a slender bronze tracing punch, a thin rod about 15 cm long with a rounded tip, which he presses against the interior surface of the vessel from above, working a line of the design by pushing the metal outward into relief. Beside him on the bench is a collection of small specialised tools arranged on a piece of folded leather: several graduated punches with different tip shapes including pointed, rounded, and chisel-edged types, a small light-weight raising hammer with a slightly domed face and short wooden handle, and a flat bronze chaser for refining details from the exterior. A dark lump of warm pitch in a shallow wooden bowl serves as a yielding support surface for the vessel during finer work. The artisan wears a knee-length tunic of dark blue-grey wool in a diagonal twill weave, belted with a plain leather belt, the tunic’s neckline finished with a narrow tablet-woven band in a contrasting lighter colour showing a small geometric meander pattern. A single bronze Certosa-type fibula with a characteristic knobbed bow and flat catchplate pins the tunic at his right shoulder. His feet are bare on the earthen floor of the workshop. His forearms show no burns but his fingertips are callused and his nails are short and blunt from years of precise hand work. The workshop is an enclosed timber-frame structure with wattle-and-daub walls, lit by a single unglazed window opening and by a small bronze-casting hearth in the corner where a clay crucible sits among banked coals, ready for melting bronze for rivets and handle attachments. On a shelf behind him, several completed or near-completed bronze vessels are visible: an undecorated cist with a flat lid, and a small plain situla. Warm golden light from the window rakes across the workbench, catching the subtle relief of the repoussee design and the sheen of the bronze tools. Photorealistic rendering, slight film grain, shallow depth of field focused on the artisan’s hands and the vessel.

Negative-Constraint Tail

iron forging, sparks flying, blacksmith scene, raised forge, anvil, modern metalworking tools, power tools, electric light, welding, soldering iron, modern workbench with vise, engraving with a burin from outside the vessel, etching with acid, gold leaf application, painted decoration, Celtic knotwork, La Tene curvilinear ornament, Viking-style interlace, medieval workshop, Roman workshop, Greek pottery painting, torc, gold jewellery, elaborate headgear, wide-brimmed hat, checked trousers, tartan, shoes with buckles, clean modern clothing, apron with pockets, dramatic shadows, lens flare, HDR, watermark, text, AI artifacts, extra fingers

Source Annotations

Repoussee technique: working from interior with punches/tracers, described in corpus: 07_situla_art.md section 5 (“the design was hammered out from the inside of the vessel using punches and chasing tools to create raised relief on the exterior surface. Fine details were then added by incision or chasing from the outside”)
Situla dimensions and form: Vace situla ~24 cm tall, sheet bronze (corpus: 07_situla_art.md section 4.1; A8_situla_art_costume.md section 1)
Tools (punches, tracers, raising hammers): Armbruster 2023, open-access PDF (corpus: B5_metalworking_tools.md entry 2)
Workshop location: Eastern Hallstatt zone, Dolenjska region — situla workshops proposed at Este-Bologna zone and Dolenjska sites (corpus: 03_metallurgy.md section 4.1; 07_situla_art.md section 2)
Pitch block: functionally necessary for repoussee support; not archaeologically attested for Hallstatt period but standard in the technique from antiquity to present (investigation.md tools section B)
Crucible: clay crucibles attested from Sticna workshop deposits (corpus: B5_metalworking_tools.md entry 5)
Costume: Eastern Hallstatt zone Ha D2-D3 male, Certosa fibula phase-correct (corpus: A3_fibulae.md entries 16-17; Certosa type dated Ha D2-D3/Lt A)
Tablet-woven border band: directly attested from Hallstatt mine textiles (corpus: A1_mine_textiles.md entry 2 — “farbig gemusterte Borte, tablet-woven band with meander and triangle motifs”)

Prompt Variant 3: Iron Bloomery Smelting at a Small Shaft Furnace

Scene Description

A scene of primary iron smelting at a small clay furnace in a woodland clearing, showing the entire smelting operation including furnace, bellows, charcoal, and the smith tending the process. This is the most technically specific variant and the one most likely to generate errors if reference images are not provided.

Positive Prompt

A historically accurate reconstruction of Hallstatt Iron Age iron smelting (~550 BC), a small bloomery operation in a woodland clearing at the edge of an Eastern Alpine settlement, documentary archaeological illustration style with dramatic natural lighting. The centrepiece is a small clay shaft furnace standing approximately 80 cm tall above ground, a rough cylindrical structure about 35 cm in external diameter, built up from rings of coarse grey-brown clay mixed with straw temper, the surface irregular and slightly cracked from repeated firing cycles, with a visible orange-red glow emanating from a single tuyere hole in the lower wall where a cylindrical clay pipe protrudes at a slight upward angle. Wisps of grey-white smoke and occasional sparks rise from the open top of the furnace, which shows a dark interior filled with layered charcoal and crushed reddish-brown iron ore. A stocky bearded man in his forties kneels beside the furnace, operating a pair of leather bag bellows: two oval goatskin bags approximately 60 cm long connected by wooden nozzle blocks to the clay tuyere, the man compressing one bag with his hands while the other re-inflates, providing a continuous but pulsing air stream into the furnace. He wears only a knee-length rough undyed wool tunic in a coarse tabby weave, the natural creamy-grey colour of undyed wool now stained with soot and charcoal dust, belted with a simple leather thong. His arms and legs are bare, the skin smudged with black charcoal dust and reddened from radiant heat. Simple rawhide shoes protect his feet. No fibula is visible; the tunic is pulled on over the head. His face is streaked with sweat and soot. Beside him on the ground, a woven basket holds fist-sized chunks of dark charcoal, and a flat stone slab holds a pile of crushed reddish-brown iron ore that has been roasted and broken into small pieces ready for charging. Leaning against a nearby tree stump are the tools for the next phase of work: a heavy iron hammer and a pair of flat-jawed iron tongs, ready for bloom consolidation after the smelt. A second figure, a younger assistant, stands behind the furnace using a long wooden pole to add a fresh charge of alternating charcoal and ore into the furnace top, careful not to disturb the burning column below. The setting is a cleared area at the edge of a beech and oak forest, with several low mounds of freshly made charcoal covered in earth and turf visible in the middle distance, thin trails of smoke rising from their vents. The ground around the furnace is blackened with old charcoal and littered with dark glassy iron slag from previous smelts, some broken to show the rough porous texture. Late afternoon sunlight filters through the forest canopy at a low angle, creating dappled golden light that contrasts with the orange glow from the furnace tuyere hole and the grey smoke. A slightly overcast sky softens the shadows. Photorealistic rendering, moderate depth of field keeping both the smith and the furnace in focus, slight film grain, naturalistic colour palette dominated by earth browns, charcoal blacks, and the warm orange of the furnace glow.

Negative-Constraint Tail

large blast furnace, tall medieval furnace, brick furnace, stone furnace, iron chimney, metal pipes, large double-action bellows with wooden frame, bellows mounted on a stand, molten iron flowing like liquid, casting iron into moulds, cast iron, steel, modern steel-making, industrial smelting, modern protective gear, safety glasses, gloves with cuffs, hard hat, heavy boots, clean clothing, Celtic knotwork, torc, gold jewellery, elaborate costume, checked trousers, tartan, Viking clothing, Roman military equipment, fantasy dwarf forge, Tolkien-style smithing, underground forge, cave smithing, dramatic volcanic lighting, lens flare, HDR, watermark, text, AI artifacts, extra fingers, deformed hands, anachronistic vegetation (palm trees, cacacia)

Source Annotations

Furnace: small clay bowl/shaft type, 30-40 cm internal diameter, based on corpus: 03_metallurgy.md (“small bowl or shaft furnaces, typically constructed of clay, with internal diameters typically under 30-40 cm, and produced blooms weighing perhaps 1-5 kg per smelt”); experimental verification from ResearchGate “Archaeometallurgical Simulations… from the Hallstatt and Medieval Period” (experiments at Asparn with Hallstatt-period bowl-type furnace); EXARC experimental data (https://exarc.net/issue-2020-2/ea/development-bloomery-furnaces)
Furnace height: ~80 cm shaft above ground for improved smelting conditions, per EXARC experimental work showing that taller shafts (up to 1 m) improve temperature gradients and ore reduction
Bag bellows: experimental reconstruction type, Dave Budd (davebudd.com); no preserved Hallstatt bellows exist (investigation.md)
Tuyere: clay cylindrical pipe, attested from furnace sites (corpus: 03_metallurgy.md)
Charcoal fuel: 8-12 kg charcoal per kg usable iron (corpus: 03_metallurgy.md); charcoal production from hardwood consistent with woodland management documented in dendro studies (corpus: 09_settlement_economy.md)
Ore: siderite and limonite/goethite, crushed and roasted before charging (corpus: 03_metallurgy.md section 3.2)
Slag: dark glassy waste product of smelting, attested at furnace sites (corpus: 03_metallurgy.md; Historic England archaeometallurgy guidelines, B5_metalworking_tools.md entry 15)
Costume: deliberately minimal — a smelting worker in rough working clothes, lower status than the smith at his forge. Undyed coarse wool tabby weave is the simplest textile type attested in the mine textile corpus (corpus: A1_mine_textiles.md)
Two-person operation: charging the furnace top while operating bellows below requires at minimum two people, consistent with the inference of organised labour at smelting sites (corpus: 03_metallurgy.md section 7; 10_social_organisation.md)
Woodland/charcoal context: significant charcoal consumption implies woodland management; forest setting with charcoal production mounds is consistent with the evidence for smelting sites near ore and wood sources (corpus: 03_metallurgy.md section 3.2; 09_settlement_economy.md section 7)

Phase-Correctness Checklist

Element	Ha C Correct?	Ha D Correct?	Notes
Ground-level forge	Yes	Yes	Consistent across both phases
Small clay bloomery furnace	Yes	Yes	Size increases over time but small bowl/shaft type spans both
Iron hammer	Transitional	Yes	Bronze hammer more likely in Ha C
Iron tongs	Transitional	Yes	Bronze or iron in Ha C, iron standard by Ha D
Bronze punches/tracers	Yes	Yes	Sheet-bronze working spans both phases
Crucibles	Yes	Yes	Clay crucibles span both phases
Schlangenfibel	No	Yes (D1)	Use Kahnfibel or Paukenfibel for Ha C
Certosa fibula	No	Yes (D2-D3)	Do NOT use for Ha C or Ha D1
Bag bellows	Yes	Yes	Inferred for both phases
Charcoal fuel	Yes	Yes	Exclusive fuel type throughout
Leather apron	Speculative	Speculative	Unattested for any Hallstatt phase
Knee-length wool tunic	Yes	Yes	Standard male dress throughout
Rawhide shoes	Yes	Yes	Mine evidence spans both phases
Checked/tartan fabric	No	No	Not attested for Hallstatt period
Gold ornament of any kind	No	No	Smith is non-elite
Raised brick/stone forge	No	No	Anachronistic for any Hallstatt phase
Horn anvil	No	No	Modern form, not attested

Regional-Correctness Notes

Variant 1 (iron smithing at forge) is set in the Western Hallstatt zone (Heuneburg sphere). Western zone smiths worked traded iron blooms rather than smelting from ore. No Negau helmets, no greaves, no situlae should appear in the workshop background.
Variant 2 (bronze repoussee) is set in the Eastern Hallstatt zone (Dolenjska, Slovenia). Certosa fibulae are regionally correct here. Situlae and cists visible in the workshop background are appropriate.
Variant 3 (bloomery smelting) is set in the Eastern Alpine zone (Styria/Carinthia/Dolenjska margins), where access to local iron ore (Huttenberg siderite, Dolenjska ores) supported primary smelting. Western zone Furstensitze did NOT typically smelt iron from ore; they worked traded blooms.