While it's true the demo takes place in a lit room, you might try dimming the lights to make the color change easier to see.
Because foldforming is a technique that work-hardens metal pretty aggressively -- and then requires the metal to be soft for unfolding -- annealing is critical to the process. And since it's a frequent step for metalsmiths in a wide variety of situations, it seems like a perfect clip to share from the conference.
August 2012 on SueLacy Wired is dedicated to the 5th annual Charles Lewton-Brain Conference on Foldforming, taking place Aug 3-6 at the Center for Metal Arts in downstate NY. To view the series, click category "5th Annual Charles Lewton-Brain Conference" in the far right column on this page.
(Are you a metalsmith interested in foldforming? Join our official Facebook group.)