What Is A Balloon Glow?

Gather 'round kiddies, and let Ole Ern tell you about the balloon glow. It was about a week and a half ago when I was at the Sun-N-Fun Fly-in, and I came across a few of these hot air balloons, all filled up with hot air, as is their way. But nobody was going anywhere because they were tightly tied to the rear bumpers of large pickup trucks. Every so often as the hot air in the balloon turned to lukewarm air, the operator would pull a handle overhead and release a generous helping of flammable gas into the balloon. At about the same time, he would flick a lit match up over his head, igniting the flammable gas and creating a giant fireball. As it got darker, these fireballs would light up the inside of the balloons, creating the glow I spoke of earlier. Now you know. It's hard to tell, but the balloon all the way on the left would be glowing if it weren't made of a dark fabric. I don't know why they included such a dark colored balloon in their glow. I guess they didn't want to exclude anyone...