Over a long period of time, because people do not recognize the harm of synthetic pigments, and synthetic pigments compared with natural pigments, has a bright color, strong coloring power, stable nature and inexpensive advantages, many countries in the food processing industry in the general use of synthetic pigments. Some synthetic colors cause cancer With the development of society and the improvement of people's living standards, more and more people have raised questions about whether the use of synthetic colors in food will cause harm to human health. At the same time, a large number of studies have pointed out that almost all synthetic colors do not provide nutrients to the human body, and some synthetic colors can even be harmful to human health. The former Soviet Union in 1968-1970 on amaranth red this food coloring for long-term animal testing, the results found that the rate of carcinogenicity is as high as 22%. The United States, Britain and other countries in the researchers have done related research also found that not only amaranth red, many other synthetic pigments also have a harmful effect on the human body, may lead to reduced fertility, teratology, etc., some pigments in the human body may be converted into carcinogenic substances. Scientific researchers say, synthetic pigment is made of coal tar as raw material, commonly known as coal tar pigment or aniline pigment, harmful to human body. Hazards include general toxicity, diarrhea, mutagenicity (gene mutation) and carcinogenic effects. Especially azo compounds synthetic coloring of the more obvious carcinogenic effect. Azo compounds in the body decomposition, can form C aromatic amine compounds, aromatic amines in the body after metabolic activities and target cells and may cause cancer. In addition, many synthetic food coloring in addition to its own or its metabolites toxic, in the production process may also be mixed with arsenic and lead. In the past for margarine coloring cream yellow, has long been proved can lead to human and animal liver cancer, and other kinds of synthetic pigments such as orange yellow can lead to subcutaneous sarcoma, liver cancer, intestinal cancer and malignant lymphoma.

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