Monthly Archives: April 2016

Animal Skins and Coated Paper: A World of Difference

The Original Writing Materials

Parchment is animal skin (such as sheep, goat, cow, hare, horse, or deer) specially prepared to be used as a writing material.

Blog38b

Parchment made from sheep skin. Photo credit: Gavin Moorhead

Vellum is made specifically from the skin of a calf specially prepared to be used as a writing material or to create book covers. Using skins as a writing surface began as early as 400 BCE, though demand decreased in the 15th century when the production of paper gained popularity.

Blog38

Vellum. Photo credit: Gavin Moorhead

Both parchment and vellum are made by soaking the skins in lime and water for a week and a half while stirring the vat a few times a day. The skins are removed from the vat and placed fur side up on a convex surface, and the fur is then scraped off. The skins are then stretched on a wooden frame, and while wet, are scraped with a knife a second time. Once dry, the skins may be made smooth by scraping with a pumice stone and dusted with chalk powder. Finally they are cut out of their frames and are trimmed and shaped.

How can we tell the difference between vellum and parchment?

Vellum typically has a finer grain, fewer flaws, and fewer colour variations. As parchment is usually created from the skins of full-grown animals, the grain is more pronounced due to larger hair follicles and there may also be evidence of old scars and discolouration.

Coated Paper

There are many types of coated paper, which include clay coatings and polymer coatings. Polymer coatings are used to achieve physical characteristics, water resistance, and to prevent ink from feathering.

Some polymer coatings may have a sheen, or cause the paper to be stiff and inflexible, producing similar qualities to parchment and vellum. This can make identification difficult.

How can we tell the difference between animal skin and coated paper?

Is there a grain or are hair follicles visible? If so, it is vellum or parchment.

Is there a variation in colour? If there is, it is supporting evidence that it is animal skin, though a variation in colour alone is not strong enough evidence to determine that it is not coated paper.

Can it be flexed easily? Vellum and parchment are stiffer than coated paper.

Is there a variation in opacity? A variation in opacity, but not in thickness, is evidence that it may be animal skin.

Are there creases or tears? If so, place a magnification loupe along one edge and look for paper fibres. Animal skin will not have visible fibres.

The Lead Team Logo

Tagged , , , , , , , , , ,

Resources for Archivists

The Lead Team receives a variety of questions about a multitude of topics. Here are a few helpful resources we have found (or created!) while assisting our members.

 

Film Care by the Image Permanence Institute https://www.filmcare.org/

This website is a great resource – it provides guidelines for working with all film formats and types. It covers storage, including how to implement low temperature storage, charts mapping degradation when film is removed from cold storage and using A-D strips. One of the most useful (and exciting!) resources on this website is the storage calculator for colour and acetate films. Input the temperature and relative humidity of the desired storage space to calculate the longevity of the film under the specified storage conditions.

 

Free Resources by the Northeast Document Conservation Center https://www.nedcc.org/free-resources/overview

The NEDCC offers many free online resources about a variety of subjects, such as preservation and disaster preparedness and recovery. They also offer a free online disaster planning template called dPlan.

 

Flood Advisory Programme by the Archives Society of Alberta http://archivesalberta.org/programs-and-services/flood-assistance/

The Flood Advisory Programme’s website offers a variety of resources focused on disaster preparedness and recovery, such as how-to videos, emergency response resources, extreme weather alerts, recommended disaster response kit list, and staff training scenarios.

 

Salvage Operations for Water Damaged Archives Collections: A Second Glance by Betty Walsh http://www.cdncouncilarchives.ca/salvage_en.pdf

This document is a great resource to review general guidelines to follow in the event of a disaster. Sections include general best practices, guidelines for packing, recovery methods and rehabilitation.

 

Orphan Works: Statement of Best Practices by the Society of American Archivists http://www.archivists.org/standards/OWBP-V4.pdf

This report is a summary of recommended best practices when handling orphan works. Sections include principles, search strategies, documentation, and resources.

 

Bill C-61 – Act to Amend the Copyright Act http://www.parl.gc.ca/HousePublications/Publication.aspx?DocId=3570473&Language=e&Mode=1

No one wants to read it, but it is necessary for understanding Canadian copyright.
The Lead Team Logo

Tagged , , , , ,