Digital BW, The Print

I haven't tried to sell any "carbon pigment" prints yet, but I've wondered 
whether it might be legitimate to answer this question by relating the 
materials to other accepted art media, especially watercolors.  For 
example, one could say "It is really impossible to predict a life span, 
because that depends on display conditions among other things.  But the 
pigments used are the same as (or "similar to") some of the most stable 
watercolor pigments and the paper is acid-free rag."  Perhaps this could be 
followed with a brief description of proper display conditions.  Is this 
satisfying?  Is it accurate?