Look at IR reflections on matte steel surfaces - you’ll probably find that the longer wavelengths get reflected quite well on a surface that is matte in visible light.
Stainless steel surfaces in the kitchen are usually a candidate - kitchen hood, front panel of the oven, the side of the microwave, the freezer, something like that.
Look at IR reflections on matte steel surfaces - you’ll probably find that the longer wavelengths get reflected quite well on a surface that is matte in visible light.
Ooh let me see if I have any at all
Stainless steel surfaces in the kitchen are usually a candidate - kitchen hood, front panel of the oven, the side of the microwave, the freezer, something like that.
Ohh yeah, the hood vent should do. Will check tomorrow!