China girls, although for decades they were ubiquitous in movie theaters. At the beginning of a reel of film, there would be a few frames of a woman’s head. She might be dressed up; she might be scowling at the camera. She might blink or move her head.But if audiences saw her, it was only because there had been a mistake. These frames weren’t for public consumption. The China girl was there to assist the lab technicians processing the film..."