Seamless Copper Kettle Crafting Techniques

Used in

• Chapter 4 Copper, Wood and Stone

In the Workshop

The lute and the seam

The rows that check it

• 6 confirmed
• 2 marked for safety

• W4 confirmed Safety Bare copper plus acid (vinegar, wine, tomato, apple, whey) gives verdigris, an emetic; every pan that meets acid is tinned
• W5 confirmed Safety Sal ammoniac at tinning heat gives off ammonia and hydrogen chloride: work outdoors, wind at your back
• W17 confirmed Copper slips on twelve planes; annealed yield 60 to 90 MPa, work-hardened over 250 MPa near the 350 UTS; cue: the hammer bounces and the note rises after one or two rounds
• W20 confirmed Sinking thins and cannot make a deep vessel; raising gathers the rim and keeps or thickens the wall; rings a hammer-face apart; stake at about 20°; strike just above the stake; …
• W22 confirmed Planishing: thousands of light overlapping blows in a spiral over a polished stake; hardens the skin; note rises from thud to ring; never annealed after
• W27 confirmed Tinning window: pan a little above 232 °C, about 250 to 280; water drop skates; flux burns and tin goes yellow then purple and beads if too hot; steps if too cold; 0.45 mm lining; …

In the Index

Copper and tin The kitchen and its dishes Berlin and Brandenburg