Take the foreign exchange quotation of 65438+2020 1 October 3rd as an example,1USD =6.97 15 RMB. 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 have been red and blue fibers in the paper of dollar bills, which are mixed with pulp when making paper.

Extended data:

Starting from 1990, a safety thread made of polyester polymer called Myra was added to the dollar paper (as shown in the left). The security line has dollar symbols and denomination figures, which can be seen clearly through perspective. The ink on the front of the dollar is black, slightly dark and slightly gray, and the back is green.

In the version after 1934, magnetic substances were added to the ink, and the magnetic real US dollar bills were specially made with special inks such as fluorescent ink and magnetic ink. Therefore, the green emblem and green numbers on the right side of the front of the US dollar bill can leave "green marks" on the paper after hard wiping. Some US dollars issued after 1996 will show black and green at different light angles.

Baidu Encyclopedia-USD

State administration of foreign exchange-central parity of RMB exchange rate