XR stands for "extended range" and this means nothing less than an amazing range of experiments. The film is rated ISO 25-200, so you can choose what to set your camera to, or what number to use as base for your manual settings.
If you shoot the film like an ordinary 200 film, it basically turns out to look like a redscale film. The fun starts when you lower the ISO and thus expose the film longer to the world outside. This comes in handy especially if you are using a camera with manual settings for the first time and you’re unsure about exposure times.
Just take the Redscale XR and expose long enough. Where standard films begin to look simply washed out, the XR reveals it’s real beauty: a redder shade of pale, bronze and golden tones, pale-ish greens and hints of blue.
This makes it the perfect film for all kinds of fun; longtime exposure in daylight, extra long pinholes, crazy multi exposures, extreme flashing and of course just plain shooting.
If you are brave enough you can go as far as rating the film as ISO 3 or even less! Chances are high that your shots will get this special “vintage” look but this might also vary depending on your lab/scanner.
Have fun and enjoy the flexibility this redscale film offers!