What classes of dyes are harmful to humans

Fluorescent brighteners are harmful to the human body.

A fluorescent brightener, or white dye, is a complex organic compound. Its characteristic is that it can excite the incident light to produce fluorescence, so that the dyed substance obtains a sparkling effect similar to glowstone, so that the substance seen by the naked eye is very white, and the effect of whitening is achieved. Because it can significantly improve the whiteness of paper, fluorescent brighteners are widely used in the paper industry, and some companies also use fluorescent brighteners to improve whiteness in the production process of napkins.

In recent years, it has been found that fluorescent brighteners have carcinogenic effects and are very harmful to human health, so it is forbidden to use fluorescent brighteners to manufacture food packaging, packaging paper and napkins in the paper industry.

There is a simple way to test whether a napkin contains a fluorescent brightener or not. Soak the napkin with water for a while, then soak the filter paper strip in it, and check it under ultraviolet light after the filter paper strip is dry. If the filter paper shows strong fluorescence, the paper sample contains a fluorescent brightener, it should be noted that although this method is fast, but the accuracy is not good, if the amount of fluorescent brightener added in the paper sample is less, the test effect is not obvious, so it is necessary to use other methods for retesting.

Most of the dyes in clothing are synthesized from aromatic amines extracted from coal tar, and benzidine reacts with nitrous acid to form diazo salts, which are conjugated to phenolic or aromatic amine compounds to obtain a variety of azo dyes. Therefore, some companies prefer to use aromatic amines with benzidine.

Long-term wear is easy to damage the liver and kidneys.

Benzidine is one of the most toxic substances in aromatic amines, and the chemical properties of benzidine are similar to aniline, which reacts with nitrous acid to form diazo salts, which are conjugated to phenolic or aromatic amine compounds to obtain a variety of azo dyes. Benzidine used to be an important intermediate in the dye industry, which is very toxic, and benzidine and its salts are carcinogens.

Summary. Kiss, chemical dyes are cheap, and the effect is obvious. Most of the chemicals used in industry are toxic, and there are no absolutes in the world, and it is not excluded that some conscientious bosses insist on protecting the environment and people's health.

Kiss, chemical dyes are cheap, and the effect is obvious. Most of the chemicals used in industry are toxic, and there are no absolutes in the world, and it is not excluded that some conscientious bosses insist on protecting the environment and people's health.

Pro-plant dyes will be better, plant dye dyeing mainly comes from various plants in nature, the dyeing process is mainly to extract pigments, and the residual liquid produced after dyeing has little harm to the environment. The use of plant dyeing is non-toxic, harmless and non-polluting to make plant dyes a sustainable resource, and the toxicity of printing and dyeing wastewater is reduced after dyeing, which is conducive to reducing sewage discharge, which not only protects the environment, but also recycles water resources. In addition, many of the plants used to extract the dye are themselves Chinese herbal medicines.

Most of these plants have medicinal effects and have health care effects on the human body, so we can use these plants to extract dye additives and use them in the functional finishing of textiles, so that the colors on textiles can be dyed at the same time and have health care effects. Therefore, compared with synthetic dyes, vegetable dyes will return to people's field of vision with their superior properties.