For many programme makers and viewers, the word 'archive' conjures up images of flickering black and white footage and grainy recordings dug up in a dusty library. But good archive can come from many sources and offer productions a rich and immersive window onto the past as well as giving contemporary stories a new perspective. This week, Denise Roach talks to radio producer Heather Davies, freelance producer and director Nico Wasserman and senior researcher Amanda Keir about the varied and often challenging world of using archive in your production.