World War I had a serious impact on the leading German dye industry at that time. 19 13 Germany's output accounted for 80% of the world's output. The war prevented Germany from supplying products to many countries, and prompted these countries to establish their own industries, confiscating the property of subsidiaries of German manufacturers in hostile countries and German patents. Because the production equipment and raw materials of explosives and tar dyes are the same, the United States established a large-scale explosive industry during the war. After the war, these factories turned to producing dyes. Before 19 14, American dyes were supplied by Germany. American Chemical Dyes Company developed in this way, and later merged with DuPont Chemical Company, the largest enterprise in the world.
In Britain, Imperial Chemical Industry Company was founded after World War I, which merged large chemical plants in Britain into a huge Konzern. Kang Zeen avoids the mutual competition of domestic enterprises, promotes cooperation, finds out the production scale and forms famous brand products. This has greatly reduced the cost and formed international competitiveness. Of course, dyes are not only used in textiles, but also in leather, paint, fur, papermaking, printing, painting and veneer decoration.