U.S. dollar banknotes are made from cotton fibers and hemp. The long cotton fibers make the paper less likely to break, absorb ink well, and resist color fading. The hemp fiber is strong and tough, making the paper stiff, durable and lint-free, and has certain resistance to water, oil and some chemicals. There is no whitening agent added to the U.S. dollar paper, it is white and does not reflect light under a purple light.

Since 1880, U.S. dollar bills have been filled with red and blue fibers, which were mixed with pulp during papermaking. Therefore, some fiber threads are sandwiched in the paper, and some are floating on the surface. The fiber threads can be picked out with the tip of a needle. Before 1928, red and blue fibers were distributed in the center of the banknote, a long and narrow strip from top to bottom. In all editions from 1928 onwards, fiber silk covers the entire edition.

Extended information:

The main image on the front of the US dollar banknote is a portrait, and the main color is black. The main scene pattern on the back is a building, and the main color is green, but there are few differences in the colors of different versions. For example, the back of the 1934 version is dark green, the back of the 1950 version is grass green, and the back of the 1963 version is all dark green. The signature above is that of the Minister of Finance, and different Ministers of Finance were responsible for different issuance years.

Among the various U.S. dollar currencies issued in the United States, the Federal Reserve Note series includes face values ??of 500, 1,000, 5,000, and 10,000 U.S. dollars, and the gold coin certificates include 1,000, 10,000, and Face value of $100,000. There are no other large-denomination banknotes with denominations above $100.

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