XPost: alt.usage.english, sci.physics   
   From: robban1@bigpond.com   
      
   On 10/08/11 1:24 AM, Jonathan de Boyne Pollard wrote:   
   >>> We say that we have a red ball, a yellow ball, and a green ball even   
   >>> though all three balls are made from the same gray material with only   
   >>> the outer surface colored.   
   >>   
   >> In your example, the outer layer is opaque.   
   >>   
   >> Is skin always opaque and therefore the only visible part of flesh?   
   >   
   > When you look at a bruise, is it really "black and blue"?   
      
   Black, blue, purple, red and, if it's starting to heal, yellow as well.   
      
   --   
   Robert Bannister   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)