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"Visual Typology of Twisted or Plaited Viking Age Rings - Part 1." by Gæira Aggadóttir.

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NOTICE -

This article was added to this set of files, called Stefan's Florilegium, with the permission of the author.

These files are available on the Internet at: http://www.florilegium.org

While the author will likely give permission for this work to be reprinted in SCA type publications, please check with the author first or check for any permissions granted at the end of this file.

Thank you,

Mark S. Harris...AKA:..Stefan li Rous

stefan at florilegium.org

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You can find more work by this author on her website at:

GaeirasAnvil.Blogspot.com

Visual Typology of Twisted or Plaited Viking Age Rings.

Part 1.

by Gæira Aggadóttir

This is Part 1 of my blog post series on the visual Typology I've worked on for twisted and/or plaited Viking Age (VA) Finger-Rings, Arm-Rings, and Neck-Rings (-Rings).

In this post I will be covering the most important elements, the metal rods and/or wire they forged and then twisted and/or plaited to form their -Rings.

Various Shapes of Forged Wire or Rod for Viking Age -Rings, Figure 1.

The extant finds are predominately made of Gold or Silver (sometimes referred to as Fine Silver) as well Gold Alloys (23 Karats and below) or Silver Alloys. There are also some -Rings identified as 'Copper Alloy' or Bronze.

Unfortunately, the majority have NOT been tested to determine their exact metallic compositions. Somewhat vague terms tend to be used, which can cause confusion, usually based on how they look.

Example, 'Copper Alloys' could mean any of the various Brass(es) or Bronze(s) we use today, but they are referring to Brass.

Non-Modern Labels for 'Copper Alloys'

The blanket term 'Copper Alloy' is used within Archaeology to label and encompass a variety of Brass items. The main component of Brass is Copper (Cu) and its secondary one is Zinc (Zn). Even if this alloy is referred to as 'Bronze' it is still 'Brass' because it contains Zinc (Zn) and not Tin (Sn).

Bronze is an alloy of Copper (Cu) and Tin (Sn). This blanket term does not specify the percentages of either element in the alloy, this can also be seen with the above term used for a Brass, 'Copper Alloy'.

Copper Alloy = Brass = Copper (Cu) and Zinc (Zn)

Bronze = Copper (Cu) and Tin (Sn)

The Copper Development Association (CDA)

The Copper Development Association (CDA) is an international association that sets the standards for Copper and Copper alloys. They do this by creating internationally recognised ID code numbers that should be strictly followed when using their ID Codes to avoid confusion.

For example Nickel Silver's CDA code number can be written in any of the following formats:

CDA#752, CDA #752, CDA 752 or Alloy 752, etc. This specifically identified Copper alloy contain 65% Copper (Cu), 17% Zinc (Zn), and 18% Nickel (Ni), and it goes by various names depending on the sellers preferences: Nickel Silver, German Silver, Nickel Alloy, etc.

The CDA code number can be written in many different ways, as seen above, and yet mean the same thing. Using the CDA approved code for a specified Alloy ensures that the mix of metallic elements, that we are referring to, is the exact Alloy we mean so that there is no doubt.

I have been unable to find a complete list of the CDA's standards and Alloy code numbers, on any of their websites. Most vendors use different terms for the same Alloy which quickly gets confusing so I compiled information from various websites, PDFs and tables into a table on my personal website entitled, 'Metal Alloy Table'. (L1)

For additional information and links please see the section entitled, 'Copper Development Association (CDA)' on my 'Metal Suppliers' resource page. (L2)

Modern ID Codes for Copper Alloys

CDA#230: The modern alloy containing 85% Copper (Cu) and 15% Zinc (Zn), is referred to as Red Brass, Jeweler's Brass, NuGold, Jeweler's Bronze, etc.

CDA#260: The modern alloy containing 70% Copper (Cu) and 30% Zinc (Zn), is referred to as Yellow Brass or Cartridge Brass, etc.

Modern ID Codes for Copper Alloys: Bronze

CDA#521: The modern alloy containing 92% Copper (Cu) and 8% Tin (Sn) is Bronze and it is also referred to as Phosphor Bronze or Grade "C" Phosphor Bronze.

CDA#521 is also significantly close to the proportions of tested extant Bronze items.

Forging an Ingot into Various Shapes of Wire or Rod, Figure 2.

On a flat anvil, place your wire or rod while holding it with a pair of pliers, hammer from one end to the other along each corner's length and use consistent force. Rotate the wire or rod a quarter turn and repeat these steps until it has parallel sides and a polygon cross-section.

Stages:

Ingot > Square [4] > Octagon [8] > Hexadecagonal [16] > Triacontadigonal [32] > Circle

Anneal when the metal's length is doubled or the thickness is halved. Use the appropriate heat for the metal being used, immediately quench it in clean water. Use non-Ferris tweezers to place it in a warm pickle solution to remove any oxidation. Thoroughly wash the metal and dry the surface before continuing.

Annealing returns work hardened metal to dead soft by returning its Ductility.

Remove the ragged ends with a saw or use a sharp cutting chisel. Rotate a 1/4 turn after each chisel strike and repeat until you cut through. Leaving the ragged ends could leave cracks or flaking that could get bigger as you work the metal causing a great deal of damage.

Links:

L1 - http://ga.crimsonkraken.com/metalAlloyTable.html

L2 - http://www.ga.crimsonkraken.com/MetalSuppliers.html

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Copyright 2019 by Georgia Panaritis. Permission is granted for republication in SCA-related publications, provided the author is credited. Addresses change, but a reasonable attempt should be made to ensure that the author is notified of the publication and if possible receives a copy.

If this article is reprinted in a publication, please place a notice in the publication that you found this article in the Florilegium. I would also appreciate an email to myself, so that I can track which articles are being reprinted. Thanks. -Stefan.