When printing some pages, it prints the background in a gold color and I would prefer white. A waste of ink....

Question

Some of these pages are receipts and news articles, but also others.

Answer 1

First, check to make sure you actually HAVE transparency by doing one of three things: change the comp's background to something other than black, click on the button at the bottom of the comp window to view the alpha channel, or click the button on the bottom of the comp window to reveal the familiar Photoshop checkerboard background.
Next, select a codec that supports alpha channels -- in Quicktime-Land, that would be Animation, PNG or Prores 4444.  For FCP, use ProRes if you can.
After that add the comp to the AE Render Queue.  In the output module, select RGB+Alpha, Millions (or trillions) Of Colors +, and Straight, i.e. not premultiplied.  If you absolutely MUST have audio (I personally have little use for it), check the appropriate  check box.
Finally, save the project and hit the render button.  DO NOT save the project again after rendering; instead, go file>Revert.  That way, if you have one of those Homer Simpson "DOH!" moments where you realize you made a mistake, you simply delete the rendered file, make corrections, and you're all set to re-render.