Information about Seed Bead

Seed Beads are uniformly shaped, spheroidal beads ranging in size from under a millimetre to several millimetres. "Seed Bead" is a generic term for any small bead. Usually rounded in shape, seed beads are most commonly used for loom and off-loom bead weaving. They may be used for simple stringing, or as spacers between other beads in jewelry. Larger seed beads are used in various fiber crafts for embellishment, or crochet with fiber or wire.

Multiple strands of seed beads make an ideal necklace that coordinates with colors of a pendant or other visual centerpiece.

Varieties

National origin

Most contemporary high-quality seed beeds are made in Japan or the Czech Republic. Japanese seed beads are generally more uniform in size, shape, and finish as well as having larger holes than Czech seed beads of the same size.

Some seed beads produced in France are available in historic "old-time" colors and are popular for use in repairing or replicating antiquities.

Lesser quality seed beads are produced in India, in People's Republic of China (PRC) and in Taiwan. Beads from these countries are less uniform in shape, hole size and finish. Dyed Chinese seed beads may transfer the dye to clothing or skin. Other Chinese seed beads have an external coating that will rub away to reveal a completely different color underneath.

Colors and Finishes

• Transparent - the glass is see-through
• Translucent - one can see light through the bead, although the light is diffused
• Opaque - the solid color prevents light from passing through the bead
• Matte - the bead is textured on a microscopic level to result in a matte finish
• silver-lined - a silvery coating which reflects light is applied to the inside of the seed bead
• copper-lined - a coppery coating which reflects a reddish light is applied to the inside of the seed bead
• bronze-lined - a bronzy coating which reflects a brown light is applied to the inside of the seed bead
• luster or lustre - a rainbow effect applied to the surface of the seed bead
• AB or aurora borealis - also a rainbow effect applied to the surface of a seed bead

Formulas for different colors of glass are closely guarded. The recipe for a true black glass was lost during World War I, and modern black glass held to sunlight is a deep purple. Examples of true black glass are circulating in jewelry pieces made to commemorate the funeral of Queen Victoria.

Glass rods made with concentric layers of color or stripes of color can be used to make patterns of color in seed beads.

Seed bead machinery uses glass rods softened to a red heat, fed into a steel die stamp that forms the shape of the bead with a reciprocating needle that forms the hole. Manual and automatic machinery is in use in the Czech Republic. As the steel dies wear eventually, they are replaced.

Cylinder beads

During the last decade, a new shape of Japanese seed bead, the cylinder bead, has become increasingly popular. Unlike regular rounded seed beads, the cylinder beads are quite uniform in shape and size and have large holes for their size. Because the ends are flat instead of rounded, work created with cylinder beads has a flat, smooth texture. Rows and columns in weaving line up more uniformly, so pattern work comes out more accurate and even.

There are now 3 versions of cylinder beads:

• Delica® made by Miyuki. Delicas are currently made in three sizes: 11/0 (the smallest), 10/0, and 8/0. Delica varieties include a "cut" Delica that reflects light from flat facets.
• Treasures (formerly Antiques) made by Toho
• Aiko - an all new, extremely precise bead made by Toho, introduced in 2005

Charlotte cut beads

Charlotte cuts are seed beads that have a single facet per bead to add sparkle. These are called "the most brilliant of all seed beads".

"Two-cut" beads are similar to "charlotte" seed beads, but are not technically the same. Two-cut beads have two flat faces rather than one.

Bugle Beads

Bugle beads have different lengths but all bugle beads will be longer than they are thick, creating a tubular shape.

Units of measure

The most popular seed bead size is 11/0 ("eleven-aught"), but sizes range from 24/0 (believed to be the smallest) to 6/0 or 5/0 (the largest). The term "aught" refers to how many beads can fit into a standard unit. The origin of the name is debatable.

Size numbers are also used. Unfortunately online vendors generally do not explain the correlation between size numbers and aughts and millimeters, which is therefore set out here.

aught size	mm diameter	beads per inch
6/0	3.3	10
8/0	2.5	13
9/0	2.2	15
10/0	2.0	16
11/0	1.8	20
13/0	1.5	27
14/0	1.4	24
15/0	1.3	25
delica/treasure	1.8	20

Methods of packaging

Seed beads are sold either by "hank" or by gram weight.

Hanks

A hank is unit bundle of strands of seed beads or bugle beads. There are usually 12 strands of 20 inches of strung beads in each modern hank of 11/0 beads. Different sizes and types of beads may be sold in hanks which have different numbers and lengths of strands. Different hanks (age, type, size) have had from 8 to 14 strands, and lengths have varied from 8 to 20 inches per strand. For example, Charlotte size 13/0 cut beads are generally on short hanks, containing 12 twelve-inch strands. Some vintage 18/0 hanks have had 10 strands of 8-10 inches (200 to 250 mm) each. 1 hank = 3.333 fathoms = 6.667 yards = 20 feet = 6096mm = 609.6cm = 6.096 meters = x grams

Czech seed beads are sold from the factories by the hank. They are often repackaged into tubes, bags, or other containers for retail sale, in quantities varying from 5 grams to 40 or more grams. When Czech beads are repackaged, they are usually sold by the gram, which creates some confusion on how many beads come on a hank. Not every 20 inch strand of size 11 beads weighs the same.

A hank of size 2 bugles or size 11 seed beads generally weighs between 30 and 40 grams, depending on manufacturing variations, coatings or linings. Purchasing Czech beads by the hank is usually better value than repackaged beads.

A production run of a custom made seed bead is 8 kilograms. The beads are produced in the Czech Republic using a 10 kilogram rod of color glass. The excess glass is recycled to form new rods. The color glass rods are produced from a larger mass melt of some 10 metric tons.

Weight

Japanese beads are sold by gram weight, seldom by the hank. Buying Japanese beads by the hank usually costs about twice as much, therefore, they are not usually sold or purchased from Japan in this manner.

Most Japanese seed beads are repackaged for retail sale in manageable quantities based on price codes. More expensive beads may be sold in 2.5 or 5 gram units. Standard Japanese seed beads are usually sold in approximately 10 gram tubes. Thus, a 250 gram wholesale package would fill 25 tubes — a bit more than the average beader would need.

One major supplier, Miyuki, sells factory packages which contain up to 1 kg of beads, and are almost always repackaged into tubes or other containers for retail sale. To accommodate the average "wholesale" customer, whether it be a bead shop or designer, some larger distributors have made deals to receive their wholesale packages of beads in smaller (50 to 250 gram) pre-packaged sizes.

Toho, the other major Japanese supplier, seems to have a more flexible packaging policy. Many of the tubed seed beads that can be found in craft stores are stamped with their name on the bottoms, indicating both a wholesale and retail packaging setup.

Confusing terminology

Seed beads used by craftspersons should not be confused with Seed Beads™: laboratory-grown beads made of PTFE used to generate seeds of protein crystals.

External links

• Bead Facts/Charts Handy charts from Bead World
• Bead Weights and Measures