I've spent the past few weeks tracking down answers to the questions: "When and why did paper become white and why was white paper so valued?" for my work on [_Paper Thin_](https://eprints.bbk.ac.uk/id/eprint/31744/). Here are some of my very abridged findings. This sounds as though it's a trivial question. Obviously, we think, it must have something to do with contrast and ensuring the best legibility. This is definitely not the case.