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Vellum

Wikipedia's first sentence called it “sort of parchment”. Today it says “prepared animal skin or membrane”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2005 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2005

Vellum (from the Latin for "wool" or "pelt") is a sort of parchment , a material for the pages of a book or codex , usually made from calf skin. The term can also refer to a manuscript or book written on such material. Vellum was originally a translucent or opaque material produced from calfskin that had been soaked, limed , and unhaired, and then dried at normal temperature under tension, usually on a wooden device called a stretching frame. Today, however, vellum is generally defined as a material made from calfskin , sheepskin , or virtually any other skin obtained from a relatively small animal, e.g., antelope . Some authorities do not even distinguish between vellum and parchment , although traditionally the former was made from an unsplit calfskin, and consequently had a grain pattern on one side (unless removed by scraping), while the latter was produced from the flesh split of a sheepskin, and consequently had no grain pattern. The important distinction between vellum (or parchment) and leather is that the former is not tanned but is prepared essentially by soaking the skin in lime and drying it under tension. Most medieval manuscripts , whether illuminated or not, were written on vellum. Uterine vellum was made in the 13th and 14th centuries from the skins of unborn or still-born animals . Limp vellum or limp-parchment bindings were used frequently in the 16th and 17th centuries, and were sometimes gilt but were also often not embellished . In later centuries vellum has been more commonly used like leather , that is, as the covering for stiff board bindings. Vellum can be stained virtually any color but seldom is, as a great part of its beauty and appeal rests in its faint grain and hair markings, as well as its warmth and simplicity.1

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 15928599.
Today
Wikipedia's first sentence called it “sort of parchment”. Today it says “prepared animal skin or membrane”. Read the current article and compare.
2005201020152020Oct '232025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.

What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since 2005, and today's defining sentence is their current revision.

Then

sort of parchment

Now

prepared animal skin or membrane

Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

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