From: LFLekx@NOSPAM.rogers.com.retro.com   
      
   On Wed, 12 Jan 2005 01:43:06 GMT, Joann Evans   
    wrote:   
      
   >   While we're at it, I note that the Delta IV exhaust was a pretty   
   >easily seen orange-ish color, as opposed to the virtually invisible   
      
      Orange?  If memory serves, hydrogen-rich would burn clear,   
   hydrocarbons burn yellow.  Orange would suggest some other type of   
   burn-rate modifier.   
      
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