Having converted a Panasonic camera to shoot infrared and built a little push-on hood to hold the special filter, I had second thoughts. Part of it was looking at the work of Pierre-Louis Ferrer on Petapixel and his own website. Obviously, I’m not that good, but I liked what he was doing.
I realised that I normally use mono film, so what was my reason for not putting the IR filter directly in front of the sensor? Besides, fitting the filter inside the camera did away with the fiddly lens hood.
I also had a close look at Ferrer’s work and I think he is using a luminosity mask to do split toning. He is applying a pale khaki tone to the highlights and possibly a touch of blue to the shadows.
So for my next trick I found a useful YouTube video on creating luminosity masks in Photoshop Elements (as I’m too cheap to spring for the full version, and it does all I could want). The basic idea is to create a mask that controls where an effect works, based on the brightness of the image. So you can do something like tone the highlights a delicate shade without changing the mid-tones or shadows.
On my first attempts I realised that the highlights in my IR images were totally blown out. Back to the camera and play with the settings. IR mono scenes are very high contrast and the camera was not holding the highlights. Since I actually want the shadows to go black, I set the camera to underexpose by one stop.
I had a chance to go out for a walk in sunshine (I felt like a battery-hen on day release), so I took the remodified camera. With a dog lead round one wrist I was very glad to not be fiddling with the filter.
So the update is that I’ve fiddled with and adjusted the camera and learned a new technique.
Not bad for a day out.
Fup Duck Photography 
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