Silk is one of the most unique, and one of the oldest fabrics in the world.
Much of the silk produced today is made from the cocoons spun by the larvae of the Bombyx mori moth, the mulberry silkworm. When a silkworm hatches from it’s egg, it ravenously consumes fresh mulberry leaves for just over a month, growing from a tiny speck to a fat caterpillar. The silkworm then begins spinning a cocoon of silk filament. In 2-3 days the silkworm can spin a continuous thread up to one mile long around itself, at which point it plans to begin it’s metamorphosis into a moth.
The silk producers have other ideas: they boil the silkworms in water, and the cocoons are unreeled onto spinning wheels which twist several filaments together to make fibres. These fibres are then woven into silk fabric.
This, clearly, is not a happy ending for the silkworm, and that’s just one of many issues with wearing silk.
One mile of filament sounds like a lot, but it takes thousands of silkworms, and many pounds of mulberry leaves to make a dress. 1 acre of mulberry trees produces over 11 tons of leaves, which will feed 240 lbs of silkworms and their cocoons, and will yield just 37 lbs of raw silk.
Like other commercial crops, the mulberry trees occupy land, consume water, and require “a plentiful supply of fertilizers” to produce a high yield of leaves. And growing a plant that bugs love to eat means controlling the bugs that you don’t want to eat it. Mulberry trees are sprayed with pesticides to kill the many other insects who also think that they are tasty.
Chemicals can also be used on the silkworms to increase the amount of silk produced. Methoprene is an insecticide and hormone disrupter which may be applied to silkworms to slow their growth rate and extend the time they spin silk.
Once a luxury fabric reserved for Chinese empresses and emperors, today silk is an mass-production industry with intense pressure on prices. While high-quality, handmade silks are still used for gowns and high-end designer clothing, most silk manufacture is a maximum-output-for-minimum-input business. Most silk production takes place in China, and a significant amount in India; neither country is known for workers rights. When Forever 21 can turn out pure silk dresses for under $30, labor concerns come to mind for the people working in the silk factories.
As well as labor concerns, health issues also afflict silk workers. Silk workers who process raw silk often suffer from asthma and respiratory diseases caused by a fine dust from the gum that binds the strands secreted by the silkworm, and a host of unpleasant skin problems.
