>>I must have missed this one a few months ago. I think it's a good starting point.
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>It looks like Ed Pikman has some good ideas too. The fallback position is to get x number of printers each with a different colour paper.

I don't know, for that amount of money my idea might be better, make x number of different reports, each one with a huge different colored shape in the background, and print on one color printer...and now they have duplex colors for fairly cheap, so you can color both sides of the page if you want to...plus there would be no need for human collation.