Natural dyes are considered as the pigments which exist organically and are extracted from natural things like animals or plants without the use of any chemical in the process.
Natural dyes are friendlier to nature as compared to the synthetic ones.
It is common, in textile industries chemicals are added to the dyes to make them consistent and suitable for industrial textile production. After the addition of chemicals, the dyes no longer remains ‘natural,’ because they have synthetic characteristics.
Usually these chemicals are used at the time of growing and harvesting of plants making the dye ‘inorganic’. For example,
- Using pesticides, herbicides, and defoliants to treat plants
- Extraction methods involving chemicals, such as when sulphuric acid is used to extract madder from plant roots.
Although natural dyes were popular for humans, it quickly fell out of favor due to the ease of use and variability of synthetic dyes. However, in this article, we will be discussing the importance of natural dyes and why they are making a comeback in today’s society.
Advantages of natural dyes:
First, the colors produced by the natural dyes and pigments are vibrant. Next, they are not only biodegradable but nontoxic and non-allergic too. This means that they’re friendly for the surroundings and can be used around people.
It is easy to extract the natural color from the plants, culmination, or vegetation. Many natural dyes also have antimicrobial residences, making them safer for kids particularly.
Additionally, natural dyes neither comprise harmful chemicals nor carcinogenic components, which are common in artificial dyes. By the use of natural dyes over these different alternatives, you’re supporting preserve the surroundings and lowering human dependence on harmful products.
Poisonous runoff and residuals from the textile manufacturing and dyeing procedure regularly end up as in our delicate oceans, we must do all we can to make sure we’re using the risk-free alternative, natural dyes.
Furthermore, the products used in producing natural dyes, particularly plants, produce no waste, not like the goods used in the synthetic dyeing system. This is because the plants skip the complete manufacturing manner it takes to create artificial dyes.
This is yet another cause why natural dyes are infinitely useful and better for the surroundings. By the usage of natural dyes instead of artificial dyes, you’re able to be closely linked to nature and you come to know what importance it performs in all of our lives.
Another exciting benefit of natural dyes is they provide higher UV absorption inside the fabric they’re used on. By wearing the garments dyed naturally, you’re capable of covering the skin from the solar’s harmful rays.
Collectively we can say:
- Natural dyes come from natural sources, hence they are not harmful to the environment, which makes it attractive for the consumers.
- Natural dyes are received from renewable assets that may be harnessed without enforcing damage to the environment.
- If you’re going for a smooth hue or soothing coloration, natural dyes let you acquire that appearance.
- Some natural dyes, which include carmine discovered in lipsticks, will not cause harm when ingested.
Disadvantages of Natural Dyes
Natural dyes no doubt are full of advantages but there are few notable disadvantages which you should know. As natural dyes are extracted naturally from plants or other organic things they are more expensive than synthetic dyes, this is because of their source material and the time it takes to extract the natural dye.
You can get the color of your choice as it depends on the fruit or flower from which you are extracting it. The hues can vary, and uniformity can be difficult to achieve.
It is no doubt a difficult process for the creation of natural dyes. The color evolution depends on different materials and takes a lot of time. However if we see their benefits for the environment these few disadvantages are nothing compared to advantages.
The dyed material starts to change the color slightly when it is exposed to sun or air.
Collectively we can say:
- A larger amount of natural dyes may be needed in order to dye a specific amount of fabric as opposed to synthetic dyes. Hence using natural dyes is more expensive than synthetic dyes.
- Color developed from natural dyes tend to fade quickly. More so, quality may not remain same.
- As the raw materials cannot be available all the time and can vary from season to season, place and species it can be difficult to produce.
- While natural dye assets are renewable, sustainability can still be a difficulty for natural dyes due to the fact generating them require extensive regions of land.
Dye is used as a sensitizer in dye sensitized solar cells which converts visible light into electricity using sensitization of the cell. Performances of these cells depends on dye. Sensitization is an important application of natural dye.Natural dyes are reducing down excessive price of metallic complicated sensitizers and also changing highly-priced chemical synthesis manner via easy extraction procedure.
Natural dye is used as photosensitizer in dye sensitized solar cells along with TiO2nano particles extracted from Hemigraphis colorata (Red flame). Anthocyanin and beta-carotene is present in this dye and it is proved by UV-Visible absorption spectroscopy and micro-Raman spectroscopic studies. The photovoltaic property of hemigraphis colorata is due to the presence of high concentration of anthocyanin.
Henna also known as lawsone. It is a red-orange pigment that has been used for the coloration of skin and hair as well as textile materials. In recent years Henna has received tremendous scientific interest for the dying of textile materials mainly due to its fluent coordination with nature. Henna has low chemical reactivity and there is no side effect on environment.
Now a days some new sources also used for pure wool dying. Celosia, Nerium, Hollyhock, Hibiscus mutabilis, Caryatia, Tegetus, Rambutan, and Curcuma these plants are used for wool dying. Animal proteins, like wool dye best in acidic conditions and are weakened by alkaline. Sources of natural dyes which are used, primarily give color to wool generally in acid dye bath.
Natural dye obtained from plants such as Black carrot, Hibiscus, Delonix, Plumeria, Combretum, Ixora, and Bischofia has been used for dying silk fabric.
During the last few years many articles discussed about natural dye have been published. This review is attempt to highlight the undesirable effect of synthetic dye on the environment and human’s health. However, up to the present moment there is no economical method to remove both the color and the toxic properties of the dyes released into the environment by synthetic dye. Natural dyes supposed to be cheap, non-toxic, renewable and sustainable resource with minimal environmental impact, have attracted the attention of the scientific community to use them.