General · EdgepediaSeptember 17, 20267 min read

Papyrus

Papyrus is a writing material made from the pith of the sedge Cyperus papyrus L., produced by the ancient Egyptians and used across the Mediterranean world for roughly four millennia. The word refers both to the support and to the plant itself. Excavators of a tomb at Saqqara discovered the earliest known roll, dated to around 2900 BC, and papyrus continued in use until the eleventh century AD, even after paper from China became the most popular writing material in the Arab world around the eighth century¹.

Key fact	Detail
Material	Sheets formed from strips of the pith of Cyperus papyrus L., laid in two perpendicular layers and pressed together without adhesive¹^•²
Period of use	Earliest known roll dated around 2900 BC (Saqqara); use continued until the eleventh century AD¹
Production history	The roll was produced essentially the same way throughout its approximately 4,000-year history¹
Format	Sheets were made into rolls, a common size being twenty sheets per roll, edges overlapped 1–2 cm and adhered with a starch-based paste¹
Scripts and languages	Hieroglyphic, hieratic, and Demotic, later Greek, Coptic, Latin, Aramaic, and Arabic¹
Storage humidity	35% relative humidity has been suggested as ideal for ancient papyri, though collection magazines are often kept at higher levels²
Light sensitivity	Accelerated aging at 90 °C and 50% RH showed that light exposure causes a strong decrease in cellulose chain length and tensile strength²
Plant status	Cyperus papyrus L., family Cyperaceae, native to Africa and northern Israel; IUCN Red List category Least Concern³

The plant

Cyperus papyrus is a sedge of the family Cyperaceae, a perennial that can reach 5.5 meters in height with culms (stems) 200 to 500 cm long and triangular in cross-section³. It grows in swamps and along lake and river margins, sometimes forming dense floating mats, at elevations from roughly 20 to 2000 meters depending on the regional flora account³. Its native range is Africa and northern Israel, and it is currently assessed as Least Concern, though it is liable to local extinctions from drainage works³.

Although the plant no longer grows in the Egyptian Nile Valley, it is generally accepted that during antiquity it was common and indigenous there. Whether it was also cultivated for papermaking, in addition to being gathered wild along the Nile, has been explored but remains an open question¹. Papyrus was one of the main export articles of Egypt⁴, and it was produced exclusively in Egypt, where the plant grew, while the finished material was exported throughout the classical world and was the most popular writing material for the ancient Greeks and Romans⁵.

Manufacture

The ancient Egyptians never documented the making of papyrus, so details of the procedure have been reconstructed from the earliest surviving description, by Pliny the Elder (circa 77–79 AD), together with modern experiments and instrumental analysis of historical samples¹.

The process began with the stalk. While still green, a 20 to 48 centimeter section was cut, the maximum length corresponding to the maximum height of a scroll, and the tough outer rind was stripped away. Thin strips of the white pith were then produced either by slicing the pith lengthwise or by peeling it with a needle from the outside to the center; modern experiments show both methods work and that considerable skill is needed to make thin, uniform strips¹.

Sheet formation. Strips were laid side by side in one vertical layer and then in a second horizontal layer, giving the sheet its characteristic crisscross structure. It is generally accepted that no adhesive was used; damper strips adhere better, apparently because moisture swells the parenchyma cells so that they lock into each other on drying. Some modern researchers find pressing until dry critical, while Pliny says sheets were pressed and dried in the sun; the exact Egyptian method is unknown¹.

The pith's internal structure explains the sheet's properties. It consists of rigid ligneous and cellulosic fibrovascular bundles, the darker striations running across the sheet, embedded in paler parenchyma tissue with cellulose and hemi-cellulose walls. The vascular bundles are dense and built of long cellulose fibrils bound by lignin and hemicellulose, while the parenchyma, separated by large voids, provides the flexibility that allowed sheets to be folded into rolls¹^•².

Formats and writing

Sheets were joined into rolls by overlapping the edges 1 to 2 centimeters and adhering them with a flexible starch-based paste; a common roll contained twenty sheets. Rolls were wound with the vertically running pith on the outside, the direction in which the sheet naturally curves, and writing was generally placed on the horizontal side, protected when rolled¹.

Scribes wrote in black and red ink. The black pigment was carbon based, from incinerated vegetable material or soot; the red was iron oxide or red ocher. The common binder identified in analyzed samples was acacia gum, with gum tragacanth less common, and brushes were made of rushes with chewed tips¹.

Decline and replacement

Papyrus had limitations that later supports addressed. It had to come from one place, and the sheet-making process left a ribbed surface that was not very flexible⁶. Parchment, made from treated animal skins, served as a durable alternative, particularly for codices, but its high cost and dependence on animal husbandry limited its early widespread use in the Islamic period⁶. The limits of papyrus strength became apparent as the codex grew popular, and parchment gradually replaced it for both rolls and codices⁷.

Paper, made from rag stock, allowed regular large-scale production and displaced papyrus in Egypt. By the middle of the ninth century the papal writing office had begun stockpiling supplies because Egyptians were producing more paper than papyrus⁸. Papyrus nonetheless remained in use until the eleventh century¹.

Aging and conservation

Ancient papyri often survive in brittle condition, having suffered from insects, microbial attack, and climatic change in humidity, temperature, light exposure, and pollution. Most surviving documents decayed slowly over centuries in dark, dry surroundings, buried in tombs or sand; after excavation, display and storage introduced light, and many collections store papyri at higher humidity than the Egyptian desert, sometimes sharing rooms with parchment or historic paper that require higher levels².

A 2022 accelerated-aging study quantified the effect of light. Papyrus sheets were aged for two months at 90 °C and 50% relative humidity, with and without light, and monitored by CIELAB color measurement, tensile testing, FTIR spectroscopy, and size exclusion chromatography with multi-angle light scattering (SEC-MALS). Light exposure caused a strong decrease in cellulose chain length and tensile strength. The total color change (Delta E, where values above 2 to 3 are easily seen) rose within two days under light and plateaued at 12 to 13 after about 10 to 15 days, while dark-aged samples reached only about 4 to 5².

Assessment methods. SEC-MALS proved the most reliable and detailed method for judging the conservation status of papyri, giving accurate molecular data on chain length and oxidation degree with low sample consumption². Comparing the rapid light-induced loss of long cellulose chains, which leveled off after 15 days, with the nearly linear loss of tensile strength, the authors concluded that mechanical properties depend not only on very long cellulose chains but on the linkages between different structural elements in papyrus tissue².

For practical care, the study recommends minimizing light exposure for exhibition and excluding light entirely in storage². Earlier preservation practice often harmed the material: in the 19th and early 20th centuries papyri were commonly taped or glued to cloth, cardboard, cellulose nitrate, or hardened gelatin sheets, or sandwiched between pieces of glass sealed with paper tape⁹. Training in current practice is now concentrated in a few places; the Papyrus Conservation Summer Seminar at the University of Michigan, first held in 2012 and run every two years except in 2020, has taught about 50 students the treatment, storage, and documentation of papyrus manuscripts¹⁰.

Ancient and modern production compared

Modern commercial papyrus, often made for facsimiles and souvenirs, differs chemically from the ancient product. Ancient papyri evidently received no chlorine-bleach treatment, which modern commercial production has used, so the aging behavior of ancient and contemporary sheets can follow different pathways and show different degradation patterns². Researchers examining modern commercial papyri have also questioned whether manufacturers follow the historic description of Pliny the Elder exclusively or add steps that alter the material's properties¹¹. Modern reconstructions of the ancient craft, documented in detail by conservators and papermakers, have not produced a writing material matching the quality of ancient papyrus⁵.

References

Topic: Encyclopedia › Life and health › Plants and algae › Seed plants › Monocots › Sedges and other monocot families › Sedges (Cyperaceae) › Sedge ecology and human uses

Initially written Sep 17, 2026 · Reviewed: Sep 30, 2026; Oct 21, 2026 · Edited: Sep 30, 2026; Oct 21, 2026 · Last review: Oct 21, 2026

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