The whole book is made from B&W pictures.
My book has a lot of black pages in it, made in bookwright. Now, they are printed gray like the whole book. Anyone experience with that? Helpdesk from Blurb not helpfull at all.
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I've just had this issue and had it resolved through customer service. Please check if your Soft Proof option under Help>Preferences turned on. If it is, turn it off and see if the pages become darker black. Mine did.
Note: This is about how the book looks on screen. I am not sure how/if it affects how the printed book looks - which I've just noticed that is your issue.