How we research

We do not run our own trials. Every guide is built from published work by papermaking organisations, conservators, and experienced makers. That is why each guide carries the label research-based.

Sources

The sources section of a guide lists only the works we opened and used for that page, with a link to each one. We do not cite a page we could not read, and we do not invent measurements or quotes.

Ranking the causes

The causes table puts the most likely cause first. That order is our editorial reading of the sources, not the result of a measurement. Where the sources disagree or say little, the guide says so.

Diagnosis, one change at a time

The diagnosis steps ask you to change one thing per sheet or per batch, so you can see which change made the difference. Your own sheets are the test. We describe what to look for.

Photographs

Some guides show an openly licensed photograph from another source. The caption names the creator and the license and links to the original. These photographs illustrate the subject. They are not pictures of our own work. Guides without a suitable photograph show none.

Corrections

If a cause, a step, or a source is wrong, write through the contact page. See the editorial policy for how we handle corrections.