Are Reactive Dyes Environmentally Friendly?
If you consider using them, Reactive Dyeing is environmentally friendly in most aspects. The small amount of dye you use can be safely discharged into the sewer or septic tank. Unlike some direct dyes, the dyes are not toxic or carcinogenic. These direct dyes have not been widely used in general-purpose dyes until recent years, and they do not require the use of toxic mordants. There are very few heavy metals, only a few colors (turquoise and cherry contain about 2% copper), and the rest are zero. The only problem with dyeing and finishing machines is that for those under drought conditions, the amount of water needed to rinse off excess unadhered dye may be too much.
The eco-friendliness of dye synthesis is another question, which is very difficult. The answer is: dyes are produced in many different factories in Europe and Asia; petroleum products are essential for the manufacture of many necessary chemicals;
The most environmentally friendly clothing is made of undyed organically grown fibers or colored by pigments grown in the fibers, such as natural colored cotton developed by Sally Fox or wool made from sheep wool of different colors. Natural dyes sound environmentally friendly, but they are not necessarily environmentally friendly. Almost all natural dyes require the use of chemical media; alum is the safest alum, but even if it is toxic, the amount swallowed by adults is only one ounce, and even for children, it can be fatal. Others have greatly expanded the range of colors that natural dyes can provide, and were important in the industry before the introduction of modern synthetic dyes, but caused major problems with the toxicity and environmental issues of dyeing machines.
Even if you ignore these issues, they themselves are not completely benign. Compared with synthetic dyes, a large amount of natural dyes are required; you only need a small amount of dyes to color a pound of fabric to a medium tone, and you may need two to three pounds of natural dyes to achieve similar colors, although most natural dyes The color almost never lasts on the fabric after regular washing, and the length does not exceed a fraction. The amount of land required to grow natural dyes may have unexpected negative effects. This is due to the transfer of land that would have been used to grow food crops or keep them in the wild. This is like the use of corn to produce corn. Ethanol is used as fuel. Dyeing mud seems to be an ideal choice.
The Reactive Dyeing supplier believes that the more likely problem for the environment is the frequent disposal and replacement of clothing. Any clothing with fast fading dyes may be discarded as soon as possible, which incurs greater costs to the environment when changing clothing. If longer-lasting dyes (such as fiber reactive dyes) can extend the service life of clothing dyed with them, they can actually reduce the cost to the environment.
In general, it is difficult or impossible to judge whether fiber reactive dyes are less environmentally friendly than any other dyes. The most environmentally friendly option is to wear undyed clothes, but is it really necessary? It is more useful to buy clothes that can last for many years, instead of changing clothes when they are old or out of date, and re-dying your own clothes instead of changing clothes.