Roman Lead
UK Particle Physics and Astronomy Research Council (PPARC) chief executive Ian Halliday (right) and Sir
William Stubbs, rector of the London Institute, against Ken McMullen's "Roman Lead" work. The lead was mined
2000 years ago in Spain, but the ship that was transporting it to Rome sank. As a result the metal lay for almost two
millennia on the seabed and was protected from any radioactive contamination due to cosmic rays. PPARC is one of
the major supporters of the Signatures of the Invisible exhibition.