What easily avaible liquids are transparent in IR?

[Antonij]

Hi
I want to make a infrared nonimaging concentrator, but since crystals needed for lenses are difficult to work with for an amateur, want to use liquids. I am interested in the 1-12 micron spectrum; what liquids could i use?

 

[DaveC426913]

https://www.physicsforums.com/threads/ir-transparent-fluids.591264/