“Hear curators, conservators and staff from the Scientific Department talking about the techniques used to create some of the masterpieces in the National Gallery Collection. Get beneath the surface of the paintings; find out what has been discovered using x-rays and modern scientific techniques.”
(from the National Gallery London website)
I produced this thematic behind-the-scenes tour in 2005-2006 and it is still available. Good stories are eternal! Recording interviews with the experts backstage in the lab and in the galleries was a fascinating experience and a great inspiration for later projects.
A few audio samples are available here.