Sorry, but that does not follow logically. The only thing you can conclude is that their machine will read our inferred-invisible color correctly. This discussion is 
pointless folks.  There are exactly three options: 
 Ian won't do 3 
right now.  That leaves finding someone else willing to change it (and take 
responsibility for the change), or options 1 and 2.  Frankly, I don't 
think an "engineering study of the variations of colored ink on paper" is 
required unless we become a defense contractor, but nonetheless options 1&2 
stand until someone qualified takes responsibility.   
Ken 
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