Well today I sidetracked a little from my Essay book, to do some pH testing on Filofax paper. I had discussed this briefly with Steve from Philofaxy, and decided to try both the cotton cream paper and white paper. For accurate testing, I sampled five sheets of each and am showing my results below.
So in conclusion, both papers are very close to pH neutral which is encouraging. The Cotton Cream is a little more alkali at 7.9 than the white paper.
Neither of them are verging on the acidic side which is good, and the white paper I have used is from 2003, so it has kept acid free for a substantial amount of time.
All in all – very encouraging!