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Saturday, November 15, 2008

Silk care symbol

Silk is a natural protein fibre, some forms of which can be woven into textiles. The best-known type of silk is obtained from cocoons made by the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture). The shimmering appearance for which silk is prized comes from the fibers' triangular prism-like structure which allows silk cloth to refract incoming light at different angles.

"Wild silks" are produced by caterpillars other than the mulberry silkworm and can be artificially cultivated. A variety of wild silks have been known and used in ChinaSouth Asia, and Europe since early times, but the scale of production was always far smaller than that of cultivated silks. They differ from the domesticated varieties in color and texture, and cocoons gathered in the wild usually have been damaged by the emerging moth before the cocoons are gathered, so the silk thread that makes up the cocoon has been torn into shorter lengths. Commercially reared silkworm pupae are killed by dipping them in boiling water before the adult moths emerge, or by piercing them with a needle, allowing the whole cocoon to be unraveled as one continuous thread. This permits a much stronger cloth to be woven from the silk. Wild silks also tend to be more difficult to dye than silk from the cultivated silkworm.

There is some evidence that small quantities of wild silk were already being produced in the Mediterranean area and the Middle East by the time the stronger, cultivated silk from China began to be imported (Hill 2003, Appendix C).

Silks are produced by several other insects, but only the silk of moth caterpillars has been used for textile manufacture. There has been some research into other silks, which differ at the molecular level. Silks are mainly produced by the larvae of insects that complete metamorphosis, but also by some adult insects such as webspinners. Silk production is especially common in the Hymenoptera (beeswasps, and ants), and is sometimes used in nest construction. Other types of arthropod produce silk, most notably variousarachnids such as spiders (see spider silk).

 Care symbol  label

Gentle in order to preserve its qualities.  Hand wash in cool water: use mild soap powders.  Sensitive to heat (therefore colorfast problems)  and rough treatment. Wash color separately.  Prints: dry flat. Do not soak. Creases.


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