the.com/infrared
The color you can't see but absolutely feel, radiating off everything warmer than absolute zero.
means Light with wavelengths just longer than red, invisible to human eyes but perceptible as heat.
from Latin infra, below, plus red — literally below red, naming the light hiding just past the visible spectrum.
Herschel's accidentDiscovered in 1800 measuring temperatures beyond visible red.
Night visionCameras read your body heat in total darkness.
TV remotesBlast invisible infrared pulses with every button press.
Snake sensePit vipers detect prey by infrared heat signatures.