Dollar notes are made of cotton fibers and hemp. Long cotton fiber makes paper not easy to break, good ink absorption and not easy to fade. Hemp fiber is tough, which makes the paper stiff for a long time and has certain resistance to water, oil and some chemicals.
One-dollar paper is white without whitening agent and does not reflect light under purple light. Since 1880, there are red and blue fibers in the paper of US dollar bills, which are mixed with pulp in the paper-making process.
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The main scene pattern on the front of the US dollar bill is a person's head, and the main color is black. The main landscape pattern on the back is architecture, and the main color is green, but there is little difference between different versions, such as the back of 1934 is dark green, the back of 1950 is grass green, and the back of 1963 is dark green. Because dollar green is an ink made of tree juice.
So the quality of each sap is different, so the color is slightly different. The signature above is the signature of the finance minister, and different release years are different finance ministers. Before the 20th century, 1, 5, 10, 25,50-cent banknotes were issued.
Compared with the small front page dollar, the big front page dollar is half the size of the small front page dollar. Interestingly, all denominations of dollars are the same size, and $20 is the most used high-denomination banknote in the United States.
Baidu Encyclopedia-USD