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.
casaccia
Messages
2
Reaction score
0
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!
 
Chemistry news on Phys.org


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.
 
Thread 'How to make Sodium Chlorate by Electrolysis of salt water?'

Thread 'How to make Sodium Chlorate by Electrolysis of salt water?'

I have a power supply for electrolysis of salt water brine, variable 3v to 6v up to 30 amps. Cathode is stainless steel, anode is carbon rods. Carbon rod surface area 42" sq. the Stainless steel cathode should be 21" sq. Salt is pure 100% salt dissolved into distilled water. I have been making saturated salt wrong. Today I learn saturated salt is, dissolve pure salt into 150°f water cool to 100°f pour into the 2 gallon brine tank. I find conflicting information about brine tank...
View full post »

Thread 'Ruthenium-Iridium compound with catalytic effects'

Engineers slash iridium use in electrolyzer catalyst by 80%, boosting path to affordable green hydrogen https://news.rice.edu/news/2025/engineers-slash-iridium-use-electrolyzer-catalyst-80-boosting-path-affordable-green Ruthenium is also fairly expensive (a year ago it was about $490/ troy oz, but has nearly doubled in price over the past year, now about $910/ troy oz). I tracks prices of Pt, Pd, Ru, Ir and Ru. Of the 5 metals, rhodium (Rh) is the most expensive. A year ago, Rh and Ir...
View full post »

Similar threads

The relationship b/w infrared, temperature, and electron excitation
Replies
11
Views
3K
I How is IR ink able to be seen with specialized filters?
Replies
3
Views
3K
Photochromic and thermochromic Materials
Replies
15
Views
8K
Question about infrared radiation
Replies
8
Views
2K
Does anyone know of a thermally-stable endothermic reaction?
Replies
9
Views
2K
Need help finding a gas or liquid that absorbs IR and allows visible.
Replies
1
Views
3K
I saw a Violin change the colour of a liquid,I don't know how
Replies
8
Views
4K
Looking to learn how infrared absorbing (700-1000nm) pigment is made
Replies
2
Views
2K
B Infrared Detectors & The 2nd Law of Thermodynamics
4
Replies
152
Views
10K
What is the difference between absorptance and absorbance in spectrophotometry?
Replies
11
Views
10K

Hot Threads

Recent Insights

Back
Top