- #1
SAZAR
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I've seen those filters for cameras (etc.) which look black (because they don't pass almost no visible light), but they allow infrared light to go right thorough it.
What is it made of? (i tried to find out on my own using google; I tried to find out what elements absorb what wavelenghts, but I couldn't find it...)
What substance does that (passes whatever and infra-red, BUT NOT visible light)? Can some of substances commonly found in household or wherever do that?
?How to improvise?
What is it made of? (i tried to find out on my own using google; I tried to find out what elements absorb what wavelenghts, but I couldn't find it...)
What substance does that (passes whatever and infra-red, BUT NOT visible light)? Can some of substances commonly found in household or wherever do that?
?How to improvise?