Parchment:

We use specially created parchment in order to reproduce the texture, smell, and correspondence of the original codexes.
In our facsimile editions, one can discern the varying thicknesses of the parchment or vellum, achieved via a detailed measurement of each one of the original manuscript folios with a micrometer.
We even respect the parchment’s irregularities, which are the result of the different external agents (woodworm, humidity, fires, etc.) of the environments in which the codexes were conserved.