Inverting or buying already inverted film is the definition for creating red pictures from a color negative film. Here's a couple of tips to use when shooting it.
First, I previously talked about how to make my own redscale film with this article.
To shoot this film it’s a must to overexpose it by one or two stops. If it’s rated at ISO 200, shoot it at ISO 100 and so on. I found it best to use ISO 400 color negative film, because of the fact that you can experiment with it a lot, say rate it at ISO 200, 100 or 50 and get different results every time. Remember that the closest you shoot at rated speed, the redder your exposure will be.
If you have a Lomo LC-A+ (the meter starts at ISO 100) and you want to shoot at ISO 50, trick the meter by putting your finger in front of it and guesstimate your shutter speed. Mostly I think I shot at 50 or 25.
The rule is: The higher the ISO you expose at, the more red you’ll get. This being a Lomography CN ISO 100 these is the result for shooting it in redscale mode at 100 ISO:
If you have any other camera, you’re good to go.