What opaque film/plastic will be transparent in the near-IR range?

Question

Do it yourself

Hello.
Comrades, I really need advice / tips from experts.
Task: you need to find a material that is not transparent in the visible light range and at the same time will not be an obstacle to infrared radiation, the near range.
Example: I see a black, opaque film/plastic with my eyes. And in the image from the night surveillance camera - I see an absolutely transparent material.
If possible, I ask you to suggest exactly the material that can be found without problems in everyday life. I mean that it was not a “flint plate”, but mainly a film or thin plastic that can be bought or ordered somewhere in an “earthly” store.
Thanks in advance dear gurus

Answer 1

Dark red polycarbonate will most likely be just that. Search in stores selling materials for promotional structures.
You can find a very saturated red color, so that nothing will be visible to the eye, but the camera will "see".