A single sheet of silver becomes a teapot through hours of hammering, heating, and patience. No casting, no machining. Just metallurgy controlled by hand.
The process is called raising, and every step is materials science in action:
- Sterling silver is 92.5% silver and 7.5% copper. Pure silver is too soft for functional ware, so copper is added as a solid-solution and precipitation strengthener.
- Each hammer blow plastically deforms the metal, multiplying dislocations in the crystal lattice. As dislocations tangle, the silver becomes harder and more brittle. This is work hardening.
- Before the sheet cracks, the craftsman anneals it at roughly 650 C. The heat lets new, strain-free grains nucleate and grow (recrystallization), restoring ductility so hammering can continue.
- This hammer, anneal, repeat cycle can happen dozens of times as a flat disc is drawn up over steel stakes into a hollow body.
Then comes planishing: thousands of light, overlapping blows with a polished hammer ...
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