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Creating falx began with obtaining appropriate iron. The Dacian territories contained iron ore deposits that were worked to produce metal suitable for weapon forging. The ore was smelted in furnaces that could reach temperatures sufficient to reduce iron oxide to metallic iron, though not hot enough to fully melt the metal. The resulting bloom—spongy mass of iron mixed with slag—required further working to consolidate and purify.
The smith reheated the bloom repeatedly, hammering it to expel slag and compact the iron into dense mass. This consolidation was critical—any significant slag inclusions would create weak points where the finished blade might fracture. The careful attention during this stage determined whether the final weapon would be reliable or would fail catastrophically in combat.
The shaping of the blade curve required systematic forging that established the basic form before refining details. The smith worked the heated iron on the anvil, each hammer blow moving metal incrementally toward desired shape. The curve had to be consistent along the blade’s length—any irregularity would create stress concentration that weakened the weapon.
The heat treatment was crucial stage where the blade’s properties were finalized. The smith heated the shaped blade to specific temperature—judged by color in the low light of the forge—then quenched it in water, oil, or other medium. The rapid cooling hardened the edge, creating martensitic steel that could hold sharp edge through repeated use. But the hardening also made the blade brittle, requiring tempering that restored some ductility and toughness.
The tempering involved reheating the hardened blade to lower temperature and allowing controlled cooling. The smith watched the colors that appeared on the polished steel surface—straw yellow, then purple, then blue—as the temperature increased. Each color corresponded to specific temperature and resulted in different balance of hardness and toughness. The smith quenched again when the optimal color appeared across the blade.
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