By way of context, please picture those little motion capture lights that are put over an actors body. I am interested in finding out if there is some kind of material that can do the same thing but only reflect infrared or, maybe UV, light.
For UV, have a look at this site: http://www.decoypaint.com/
Similar products seem to exist for IR - look for solar roof coating.
If you want real suggestions you probably need to define your needs a bit more - although this is pretty off-topic already.
A lot of ordinary black materials reflect or are transparent in infrared light, especially plastics..
It's a real pain building infrared instruments to find something that's actually black in some bands.