"Have you seen film before?" Lydia was happy to explain, pulling over a stool and nudging one towards Nanami. "I can't really show you until I have everything I need, but once I do I'll let you watch if you want." A friendly smile, before launching into details.

"Basically the film when you get it, is in little rolls and you load those into the camera. Inside that roll is what will be negatives. Camera's work by use of light and contrast. If you ever look at a negative, it's like a really dark brown opposite-colored picture of whatever you took. It's also really small. To get actual photographs as we know from it, you need to have special chemicals and tools to help copy and reverse these images, and make them larger, and it has to be done without bright lights or the images will fade. A dark-room can be made entirely dark, although a red-light is often used as it doesn't affect things the same way."

Not entirely accurate, but hopefully accurate enough.

"Basically if I took my film, and exposed it in a normal room, it would just turn entirely white and I'd have no picture."