>   
   >   
   > Whiteness requires many scattering events, so it's very sensitive to   
   >   
   > small amounts of loss.  TiO2 starts to fall off quite badly by 400 nm.   
      
      
   Nevertheless, you use it at lower frequencies, since your Krylon paint no   
   doubt uses tiO2.   
   I have some settling in the freezer.   
   jb   
      
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