Maundy bowl (left) and oil-spot patterned bowl (right), 1996.
© Science Museum / Science & Society Picture Library
During the 1990s, Mokume Gane, an ancient Japanese metal working technique, was reinvented using diffusion bonding. The Maundy bowl contains 21 layers of 'Mokume Gane' metal, comprising layers of nickel silver (60 per cent copper, 18 per cent nickel and 22 per cent zinc) and copper. The second contains 25 layers of fine silver, shibuishi (67 per cent copper and 33 per cent silver), and gilding metal. The Maundy bowl was raised with the pattern on the inside and patinated with ammonia vapour, while the other was raised from a plain sheet and the pattern punched into it. Made by Ian Ferguson.