A facsimile book is the reproduction of a specific volume made with the greatest fidelity in each and every one of its details. Unlike anastatic copies, facsimiles not only reproduce the text but also all the material properties of the book as an object, such as the size of the pages, the weight of the sheets, the color range of the decorations, the materials of the binding and the precious elements, to the point of making them identical to those of the book. This implies also reproducing in the copy all the defects of the book (woodworm, traces of humidity, signs of use, impurities, missing parts), which represent, for all intents and purposes, traces of its history. The binding of the volume is done by hand, using materials similar to the originals to create a replica of the original. Only when all these requirements are met can we speak of a facsimile edition and not of other forms of reproduction of an original, such as an anastatic edition.
In almost all cases the books reproduced are handwritten works, mainly those decorated as medieval or Renaissance illuminated manuscripts.
The facsimile is accompanied by a volume of comments, which contains historical-artistic studies about the reproduced volume and, on some occasions, also the translation of the text of the book. The publisher also undertakes to guarantee not only the integrity of the facsimile and its fidelity to the original, but also certifies a limited print run (less than a thousand copies, unique and without the possibility of reprinting) and the number of copies of each volume.