http://www.tvo.org/podcasts/bi/audio/BI_PhilipBall_031205.mp3 Philip Ball on Chemistry and Colour in Art http://feeds.tvo.org/~r/tvobigideas/~3/z-6aL0J7NX8/BI_PhilipBall_031205.mp3 2009-06-13 http://www.tvo.org/podcasts/bi/images/BIAlbumArt.jpg