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I want a character to invent the codex (that is, modern-shape books) in Ancient Egypt, which means that the primary writing material is papyrus. However, most book binding processes involve sections of folded sheets glued or sewn together. Also, the quickest demonstration of the advantage of a codex over a scroll is to take the scroll and fold it concertina-wise to show how you can easily access parts from different ends of the document.

Therefore, my question is this: Does anyone have a good source or experience whether a sheet of papyrus can be creased as tightly as paper can, or does it break?

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    $\begingroup$ I'm voting to close this question because this is about certain technology and it's limitations. Answer to that could be find on any site that describe the technology of papyrus production. $\endgroup$ – SZCZERZO KŁY Jul 30 at 10:39
  • $\begingroup$ Welcome to the site, AlienAtSystem. Please note that the Worldbuilding SE is dedicated to providing detailed answers to specific questions you have while developing your world. This question doesn't appear to be about anything you're building, per se; rather it's about a real, existing technology for which there is plenty of documentation about. I would imagine it possible to be able to buy papyrus and experiment for yourself. Questions asking about the limitations of an existing technology are routinely put on hold for being outside the site's scope. $\endgroup$ – Frostfyre Jul 30 at 12:34
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    $\begingroup$ Given that this is an alternate history, I don't have a problem with the fact that the technology/materials are real-life ones. They don't all have to be impossible questions (what if time travel was real, what if centaurs existed) and, in fact, a large number of our open questions are about real things. Voting to reopen. $\endgroup$ – Cyn says make Monica whole Jul 30 at 15:19
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    $\begingroup$ This query has already been closed and reopened: give it a rest already! And please state your rationale, perhaps in Meta, why this question should be closed again! $\endgroup$ – elemtilas Jul 30 at 21:55
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    $\begingroup$ @SZCZERZO KŁY Good old StackOverflow hospitality. $\endgroup$ – Henry Henrinson Jul 31 at 15:24
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Reality Check

Although you've already gotten basic answers, I'll address the specifics of your question.

As others have stated, yes papyrus can be "folded" and yes, papyrus can be "folded" into books. Ancient codices do in fact exist. However, that's not what you asked. Your question is can papyrus be creased as tightly as paper can, or does it break?

The answer(s) are no it can't and yes it will break.

Here at the Practical Geopoetry Foundation, we have obtained a fresh, unfolded papyrus scroll, fresh from the antiquities market of old Cairo:

https://i.postimg.cc/P5DtdBJg/papyrus-1.jpg

A detail of the area to be folded, showing the large strands of fibre:

enter image description here

The back side of the same region before folding:

enter image description here

The fold after creasing and pressing:

enter image description here

As you can see, the papyrus is folded. During the process, one can hear the snapping of the vertical fibres and feel the slightly jagged edge where the layer separated. Also, you can see clearly that the papyrus fold is not as tight as that obtainable with either rag or wood pulp paper.

Paper folds much tighter:

enter image description here

If you've never worked with papyrus, it is a rather thick, quite heavy duty material. It's made by pasting layers of plant fibre together, horizontal over vertical. It's an okay writing surface, though not as nice and smooth as vellum or paper. The thick fibres make it difficult, though not impossible to fold. The material will eventually crumble along the fold.

Conclusion

Of course, your character can invent the codex at any time papyrus was available. She just won't be able to get a neat & tightly folded book without actually damaging the material in the process.

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  • $\begingroup$ @Joshua --- fixed. $\endgroup$ – elemtilas Jul 31 at 17:28
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Papyrus can be folded like paper.

Ancient jewish communities would write documents in papyrus, then they would roll the papyrus, flatten it, and finally fold it:

(...) Papyrus legal scrolls are rolled, flattened, folded in thirds the bound with a knotted string then sealed with two pieces (...)

(...) Unlike contracts which were rolled up and folded in thirds, letters were rolled up and folded in half, addressed on one of the exposed bands with the name of the sender and the recipient (and sometimes the destination [TAD A2.1–7]), and then tied and sealed just like the contracts." (ABD, Elephantine Papyri)

The site in the link also has this image:

Folded papyrus

As you can see, some folded papyrus documents have survived the ages well-preserved. The elephantine ones are from a handful centuries before Christ.

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Papyrus can be fold to form a codex, and it was

The reason you give (non-linear reading) was the main reason to use codex rather than scrolls, and a particular book make the codex format known: The Bible

One example that comes to my mind is the Bodmer VIII Papyrus

papyrus

18 thick folios contain the text of the Epistles attributed to St. Peter and constitute the final part of an original codex made of papyrus that in its complete version should have had at least 180 pages as suggested by Michel Testuz.

However, this may depend on the period events occurred. As I said, Codex become popular with the raise of christianity, but the Volumen was much more common before Christ

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Have you considered a binder-format codex?

The problem you have is that papyrus is harder to fold. Not impossible, but harder. What if you used a system that doesn't require folding? There are 2 main ways to bind individual pages where you don't need to fold the pages themselves: the Atoma variation:

enter image description here

And the ring variation:

enter image description here

Both of these variations to me appear like it's possible to make them with materials from the Ancient Egyptian timeline.

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    $\begingroup$ I would think the most plausible method would be to sew the pages together? A method used in old books. Perhaps with additional gluing to attach a spine? $\endgroup$ – Jack Aidley Jul 31 at 20:21
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@Nzall has a good idea in having loose pages bound, rather than using folding, but a more authentic earlier style would be sewing the pages together. While tightly sewn papyrus pages would still need some folding to "open" the pages where required, a loosely sewn binding could mimic a metal ring or spiral binding to allow careful turning of the pages to allow them to lie flat. While most bindings sew through folded pages, this is not a strict requirement.

Your protagonist could also add heavier fabric covers to help protect the codex while it is stored.

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