Simultaneous and interrelated progress dye chemistry and organic chemistry over the past ninety years has led to the synthesis of a variety of striking colors, and further possibilities for their synthesis are not restricted. Dyes, which at first glance seemed to be of practical interest, subject to a thorough assessment of the laboratories aniline production, and only the best are found constant use in the industry. One almost has to use the dye for at least a hundred invalidated for some reason. Currently, textile and other industries use dyes dyes used in 1500. This figure makes it easy to imagine the scope of the research work on the synthesis of dyes. Color Index, published in 1924, describes the 1230 colors. The number of brands of dyes has increased during this period, but the most important change is that some of the dyes mentioned in the Color Index, out of date and there are new dyes with improved properties.
Until recently, coal tar was the main raw material for synthetic dyes. Development of aniline production has led to the isolation and study of the increasing number of fractions of coal tar, which greatly advanced the chemistry of carbocyclic and heterocyclic series. Synthesis of dye from coal tar includes a number of intermediates and reactions, and this, in turn, has led to numerous discoveries in organic chemistry and technology. Chemical dyes stimulated quantum mechanical study on the relationship between the electronic structure of downtime and a complex molecule and the absorption of light. That dominant position in the production of dyes, which occupied Germany before the First World War, was achieved through the promotion of research in the chemistry of dyes, and the whole of organic chemistry.
Along with the progress of aniline industry and as a result, progress is continuing development of chemical technology of textile industry. Each aniline production anxious to have at its disposal the laboratory, which will provide technical services and information relating to the use of products
this production. However, the work of laboratories typically go beyond these requirements. It is thanks to the work in such laboratories were first introduced in the technology many new processes of dyeing, printing and finishing fabrics. This particularly applies to the processing of new fibers, some of which (such as nylon) are open and produced aniline organizations.