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Vellum

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Vellum is a high-quality material prepared from animal skin or membrane. It is primarily used as a surface for writing and printing. This material can be fashioned into single pages, long scrolls, or codices, which are types of books.

While often used interchangeably with the term parchment, vellum is frequently distinguished by its superior quality. Many people also define vellum specifically as material made from calfskin. Because it is quite durable, vellum can last for over a millennium.

Qur'anic Manuscript - 3 - Hijazi script
Qur'anic Manuscript - 3 - Hijazi script

This longevity makes it a preferred choice for significant historical documents and diplomas.

The manufacturing process is a precise sequence of cleaning and tensioning. First, the animal skin is washed with water and lime, which is calcium hydroxide. The skin soaks in this lime for several days to soften it and remove hair. Once the skin is clear, two distinct sides emerge: the hairy side and the body side. The inside body side is typically lighter and more refined for writing.

Treatises On Natural Science, Philosophy, And Mathematics - Planets
Treatises On Natural Science, Philosophy, And Mathematics - Planets

To create the necessary tension, the skin is stretched on a frame called a herse. Workers use a crescent-shaped knife known as a lunellum to scrape the skin. This process alternates between scraping, wetting, and drying to ensure the membrane is properly prepared.

There are several ways to categorize and name these skins. The word vellum comes from the Old French "velin," meaning calfskin. In historical European contexts, it referred to the highest quality skin regardless of the animal source. Common animals included sheep, goats, and calves, though deer or camels were used occasionally. Some extremely fine skins were called "uterine vellum," a term for skins from young or unborn animals.

1638vellumlarge
1638vellumlarge

Modern scholars often prefer the broader term "membrane." This avoids confusion because it is difficult to identify the specific animal or age without scientific analysis. Some modern craft practitioners reserve the word vellum strictly for calfskin.

Preparing a page for a scribe involves several technical steps. Once the vellum is dry, the surface is cleaned with pumice. It is then treated with lime or chalk to achieve its final look and texture. To ensure ink adheres well, makers use a technique called "pouncing," which involves rubbing the sheets with a round, flat object.

Portolan by Jacobus Russus of Messina 1533
Portolan by Jacobus Russus of Messina 1533

Scribes also used a method called "pricking" to prepare for ruling. This involved making small holes in the membrane to guide the lines. Horizontal lines served as baselines for text, while vertical lines marked the column boundaries.

History shows that vellum has been used for many prestigious purposes. The Winchester Bible, a twelfth-century work, required approximately 250 calfskins. In 1455, Johannes Gutenberg printed a quarter of his first Bible edition on vellum.

Portolan by Jacobus Russus of Messina 1533
Portolan by Jacobus Russus of Messina 1533

In religious traditions, all Sifrei Torah are written on kosher klaf or vellum. Vellum was also vital for art, such as portolan charts and paintings that needed to travel long distances. It was even used for bookbindings, known as limp vellum, during the sixteenth and seventeenth centuries.

In the modern era, animal vellum has become expensive and difficult to source. The British government recently moved toward using archival paper for many official acts. However, the UK House of Lords has continued to fund vellum for certain legislative uses. In England, the company William Cowley has produced traditional vellum since 1870.

Today, many people use "paper vellum," which is actually made from plant cellulose fibers. This imitation is much cheaper and is used for technical drawings, blueprints, and tracing.

Because vellum is organic, it requires very specific environmental conditions for preservation. It is best stored in a stable environment with a constant temperature. The relative humidity should ideally be kept at 30 percent. If the humidity drops below 11 percent, the material becomes fragile and prone to breaking.

Treatises On Natural Science, Philosophy, And Mathematics - Planets
Treatises On Natural Science, Philosophy, And Mathematics - Planets

Conversely, if humidity rises above 40 percent, the vellum may suffer from mold, fungus, or gelation. This creates a unique challenge for libraries, as the ideal storage for vellum differs from the ideal storage for paper.

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🖼️ Images & Media (5)
File:Magna Carta (British Library Cotton MS Augustus II.106).jpg
Magna Carta (British Library Cotton MS...
File:1638vellumlarge.jpg
1638vellumlarge.jpg
File:Qur'anic Manuscript - 3 - Hijazi script.jpg
Qur'anic Manuscript - 3 - Hijazi script.jpg
File:Portolan by Jacobus Russus of Messina 1533.jpg
Portolan by Jacobus Russus of Messina 1533.jpg
File:Treatises On Natural Science, Philosophy, And Mathematics - Planets.jpg
Treatises On Natural Science, Philosophy,...
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