and deaf smith dispatching a mexican solider while henry karnes tussles with a colonel, and edward burlesonleading the infantry. >> it was a whole new way of looking at the story of the battle. >> but if heritage wants to sell the painting for big bucks, it must do a lot more to demonstrate it's indeed what it appears to be, a second mural of harry mcardle's favorite subject, painted by the master himself. >> there are a lot of really great reproductions that are being made now. so you have to always be very cautious. >> so, heritage performs infrared scans of the canvas to see what's underneath the top layer of paint. >> if you have something that's a forgery, generally it's a one-to-one copy. but when you're working on an original work, an artist often makes changes. >> those changes will show up on a scan as ghost images if the painting is in fact an original. take a close look at the flagpole. >> when you look at the underpainting in the infrared, you see a ghost image of the flagpole that's actually at a different angle, which means at some point when he was working on it, he looked at