You don't need to print anything imho. 'Print' a blank page and a page 
with representative graphics which you wish to use, both to lossless 
image files (I would use pbm). Then evaluate their densities. The 
density is simply the sum of the values of all pixels, for each. This 
can be broken down by RGB and/or black (depending whenther the images 
are BW or color). Then divide. That's it. Since no printer is involved 
someone else could do it for you and email the results. Of course this 
does not account for the 'blackness' of the print.

hope this helps,
Peter

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