Textile bleaching: How much harm does it do?
July 30, 2008 at 8:11 pm (CHEMICAL TOXICITY, CLOTHING, COTTON, DYES, ECONOMICS OF GREEN FASHION, ENVIRONMENT, FASHION, GREEN BUSINESS CONSIDERATIONS, GREEN ECO FASHION, GREEN LAUNDRY, ORGANIC COTTON, ORGANIC FIBERS, WOMEN'S APPAREL)
Tags: BLEACH, DYES, DYING, ECO-FASHION, ENVIRONMENT, FASHION, GREEN COTTON, GREEN FASHION, ORGANIC COTTON, STYLE, SUSTAINABLITY, TEXTILES, WOMEN'S CLOTHING, WOMEN'S FASHION

Most natural textiles – cotton, wool, linen, tencel, bamboo – are naturally cream or pale brown. Almost universally these fabrics are bleached before dyeing.
Natural shades of textiles vary, and starting the dye process with a white fabric enables the factory to anticipate the final color more precisely.
So honestly, how safe and environmentally friendly is it to bleach fabrics?
You know that bottle of bleach in your laundry room? The one with the safety cap, the warnings not to drink it or let children handle it or inhale the fumes or mix it with anything lest it go bang? That’s the exact same product that textiles are bleached with. And, often discharged into rivers.
The most widely used industrial bleaches are chlorine compounds, usually sodium hypochlorite – household bleach - or chlorine dioxide. Both are hazardous to factory workers, who are at risk of burns, lung and eye injuries.
So how do industrial bleaches affect the environment?
Sodium hypochlorite oxidizes organic matter in rivers and oceans to produce chemicals called trihalomethanes, some of which are carcinogenic.
Chlorine dioxide also produces trihalomethanes in waterways. It also can form dioxins – carcinogens, mutagens, and tetrogenic compounds - which the body stores in fatty tissues almost indefinitely.
Bleaching also consumes large amounts of natural resources; primarily vast quantities of water used to rinse the fabric after bleaching, otherwise any residual bleach would weaken the fibers.
What are the alternatives to bleach ?
Unbleached fabrics clearly have an environmental advantage. Here’s a skater t-shirt for dudes, and if I was four, I’d have a tantrum for this gorgeous little dress.
For other colors – and particularly for white and pale colors, such as achieving perfectly white jeans, or a pure white wedding dress, require the use of bleach.
Less environmentally damaging solutions to bleaching are the use of either hydrogen peroxide or ozone bleach. Both are chlorine-free, fairly benign chemical processes which produce no dioxins or trihalomethanes, and use less energy and water than chlorine-based bleach.
According to an ozone bleach promotional website, chlorine bleaching requires 8.28MJ of energy, and emits 800g of CO2 to whiten 1kg of cotton yarn.
To bleach the same amount of cotton with ozone bleach would require 60% less energy and produce half the CO2 emissions.
Ozone breaks down into pure oxygen as it bleaches, with no other by-products. But it’s hard to use, and factories must invest in new bleaching machinery to use ozone. Some factories are beginning to use ozone bleach in conjunction with chlorine bleach to reduce the quantity of chlorine bleach used – a step in the right direction.
Hydrogen peroxide has a similarly low environmental impact, as it breaks down into water and oxygen as it bleaches. It’s also easier to use, and products bleached with hydrogen peroxide are on our shelves (or our virtual shelves). Loop’s organic cotton towels and bedding are bleached with hydrogen peroxide, and ROMP’s organic white cotton shirts printed with French song lyrics are too.
Could Chlorine Bleaching Be Eliminated From the Textile Industry?
Chlorine bleaching currently dominates the textile industry but existing alternative technologies exist that can be used reasonably easily and cheaply, and have much lower environmental impact. Bleach pollution is a major problem, but it is one with a solution, and it’s possible that one day it will be history.
And for brides to be: yes! you can buy a wedding dress with without bleach. Olivia Luca’s wedding dresses made from unbleached fair trade handwoven silk shantung are elegant and eco-friendly.
Photo source above: Flickr







