Does anyone know which, if any, liquids or chemicals absorb infrared

AI Thread Summary
The discussion centers on the search for liquids or chemicals that absorb infrared light while remaining transparent in the visible spectrum. Participants note that certain materials, like KCl and AgCl, are used in infrared spectrometers, and mention that glass and webcam lens materials absorb infrared but allow visible light to pass. The main goal is to identify a substance that can function as "invisible ink," visible only through an infrared camera. This specific application requires a clear liquid that appears dark or black in infrared, suitable for creating hidden messages detectable solely by infrared imaging.
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Does anyone know which, if any, liquids or chemicals absorb infrared light but not visible light? In other words, something that looks clear but appears dark or black when viewed in infrared.
Help is greatly appreciated!
 
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I know that the optics in infrared spectrometers are made with special materials. The cell used to hold your sample might be KCl or AgCl for example. Apparently glass absorbs IR! The lens material on your webcam also absorbs IR but passes visible light.
 


Thanks for your help chemisttree. However, I'm specifically looking for something that could act like invisible ink. I have modified a camera to see only infrared, and I want to find something that I could use to write something that is only visible through the camera.
 

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