Early European paper mills, including the earliest Fabriano operations, depended on used linen cloth as their primary raw material. Linen — woven from flax fibres — had been the dominant textile of the Mediterranean basin for centuries and was available in quantity from the worn garments and household linens circulating through rag dealers. The resulting paper was serviceable but variable in colour, tending toward grey or buff tones that darkened further with age.
The Advantages of Cotton
Cotton fibres, derived from the seed hairs of Gossypium species, differ from linen in one critical respect: the cellulose they contain is almost chemically pure, with fewer lignin and hemicellulose contaminants to yellow and embrittle a sheet over time. When Fabriano mills began processing cotton rags alongside linen — a transition documented in mill inventories from the late 14th century — the effect on sheet colour was immediate. Cotton-dominant furnishes produced white sheets that required no artificial bleaching and retained their brightness under archival conditions.
A second advantage was mechanical: cotton fibres, being shorter and more crimped than flax, dispersed more evenly in the water suspension called the furnish. Sheets formed from well-beaten cotton pulp showed fewer localised thickness variations — a property particularly valued by engravers and calligraphers working on large-format sheets where surface consistency affected ink behaviour across the entire composition.
Rag Collection and Sorting
The quality of the finished sheet depended heavily on the quality and pre-sorting of incoming rags. Fabriano mills maintained dedicated rag halls where incoming material was sorted by fibre type, colour, and degree of wear. White cotton cloth commanded the highest price and was reserved for premium writing paper; coloured and mixed-fibre materials went into lower grades used for packing and wrapping.
A municipal regulation preserved in the Fabriano civic archive, dating to 1376, prohibits the sale of rags to mills outside the commune without prior offer to local buyers — evidence both of the scale of raw-material demand and of the economic importance the industry had already assumed for the town.
The Maceration Sequence
Clean rags were first steeped in water for several days in stone tanks — a controlled rotting process that began breaking cellulose bonds without destroying fibre integrity. This retting stage was temperature-sensitive: Fabriano's mills, situated along the Giano stream, drew water at a relatively consistent temperature that reduced the risk of over-fermentation during summer months.
After retting, partially broken-down rags entered the stamping mill — a horizontal waterwheel driving wooden hammers that beat the wet mass against stone or wood troughs. In Fabriano, the earliest stamping mills used hammer heads fitted with iron nails that tore and separated fibres without the fibre-shortening characteristic of the later Dutch beating engine. Longer fibres produced sheets with better tear resistance — a property archivists now use when distinguishing 13th- and 14th-century Fabriano stock from later mechanically-processed substitutes.
Beating and Furnish Preparation
The macerated fibre, now a grey-white slurry, was transferred to the hollander or, in earlier periods, continued under the stamps until it reached the correct degree of hydration and fibre length. A fully beaten furnish — one in which fibres had been collapsed and developed into ribbon-like structures through mechanical compression — produced a denser sheet with improved surface bonding. The vatman's judgment of furnish readiness was empirical: a handful of slurry drained through the fingers at a rate that experience taught him to recognise.
Vatting and Sheet Formation
The diluted furnish — typically around one percent fibre by weight — was transferred to the vat, a large wooden or stone tank maintained at a temperature above ambient to keep fibres in suspension without encouraging microbial contamination. The vatman dipped the mould — the wire-framed rectangle that also carried the watermark wires — into the vat at an angle, scooped a measured volume of furnish, and raised it level, simultaneously shaking the mould in a characteristic two-directional motion that encouraged fibres to interlace before free water drained away.
This shaking motion — and the skill required to execute it consistently — is part of why hand-formed sheets differ in structural character from machine-made paper: the fibre orientation in hand sheets is more random, producing a sheet with more uniform strength in all directions.
Sizing: The Fabriano Contribution
Once formed and pressed, the sheet was dried and then passed through a vat of animal glue — a solution made from boiled hide and bone scraps. This sizing step, introduced systematically in Fabriano and documented as absent from earlier Spanish and French mills, sealed the surface of the sheet against ink spread. Without sizing, iron-gall ink penetrated through the sheet and feathered outward from the pen stroke. With sizing, the ink sat on the surface long enough to oxidise and bond before it could migrate.
The practical significance for archival documents was large: sized Fabriano sheets allowed fine-detail script that degraded slowly, while unsized paper from other centres had to be written at larger scale to compensate for feathering — a constraint on document density that became economically relevant as archives expanded.
From Stamp Mill to Hollander
The Dutch beating engine — the hollander — arrived in Fabriano's mills during the early 18th century, replacing the iron-tipped stamps for most grades of production. The hollander's cylindrical beater roll, rotating against a bedplate, produced a more uniform furnish in a fraction of the time but at the cost of shorter fibres and a sheet with reduced tear resistance at equivalent weight. Premium hand-sheet production continued alongside mechanised output in Fabriano well into the 19th century, with Pietro Miliani's Cartiere Miliani maintaining separate hand-vatting facilities for state security paper — banknotes, passport stock, and stamp paper — where fibre length and dimensional stability were specified contractually.
Last updated: May 2026. Sources: Archivio di Stato di Ancona, Fondo Miliani; Dard Hunter, Papermaking: The History and Technique of an Ancient Craft (1947); IAPMA technical references.
