[HN Gopher] Ultrapure Water
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       Ultrapure Water
        
       Author : picture
       Score  : 15 points
       Date   : 2022-08-03 17:14 UTC (5 hours ago)
        
 (HTM) web link (asianometry.substack.com)
 (TXT) w3m dump (asianometry.substack.com)
        
       | exmadscientist wrote:
       | The strangest thing about ultrapure water, to my mind, is that
       | it's blue. Well and truly blue, like you'd see in a cartoon. Blue
       | in a way that ordinary water or even ultrapure heavy water
       | aren't. (Supposedly, for heavy water. You need a decent amount of
       | the stuff to really be sure of the color with your own eyes, and
       | I've never actually seen that much heavy water, let alone
       | ultrapure heavy water.)
       | 
       | You'll not find this on Wikipedia, so it surprised us a bit when
       | we first saw it. But it's in the literature if you know where to
       | look. Or we could just trust our eyes and our resistivity
       | probes... neither were lying.
        
         | MrFoof wrote:
         | Is the material itself blue, or is it structural color?
         | 
         | I ask because I'm aware (as far as I believe) that hydrogen gas
         | is colorless, and the solid hydrogens I've seen certainly
         | aren't blue.
         | 
         | Though structural color is a rabbit hole I've had to go down
         | recently for an application (where the component materials have
         | no color), so it wouldn't surprise me that some materials at
         | ridiculous levels of purity get interpreted as certain colors
         | only because of the interference of light through the material.
        
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       (page generated 2022-08-03 23:02 UTC)