The US Federal Reserve has released a simple method for detecting counterfeit banknotes, details below.
As is public knowledge, the US dollar continues to be the preferred method of savings for Argentines. Since there are so many restrictions to obtain them legally, the informal market and effective transactions are what predominate in our country.
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As a result of this situation, it is essential to know if the 100 dollar bill what we are buying is true or false. For this reason, we accessed the report that the United States Federal Reserve (FED) has communicated to identify each of the security measures that allow us to decipher the truth or falsity of the copies.


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Comparison between the large and small side of the 100 dollar bill.
100 dollar bills, large face: the 5 security measures
These banknotes considered in our country “big face” They are part of the most recent series issued by the FED. They are very different from the previous ones, and that is why the agency has decided to make a detailed report showing each of the security measures to avoid fraud and the circulation of counterfeit bills.
These measures, which we will detail below, are the 3D security band, the color-changing ink, the security thread, the watermark and the bell in the inkwell.
Security thread
By holding the bill up to the light, you can see the security thread to the left of the portrait of Benjamin Franklin with the letters USA and the number 100 running along it. This thread appears pink when illuminated with ultraviolet light.
Safety band in 3D
By tilting the bill back and forth, to the right of Franklin’s portrait you can see a blue, 3D band and how the numbers 100 inside it move from side to side and up and down.
Bell in the inkwell
The bell in the inkwell changes from copper to green the moment we move it.
Watermark
When holding the bill up to the light, on the right side, next to the seal of the United States Department of the Treasury, you can see a watermark with the portrait of Benjamin Franklin, right next to the number 100 superimposed on said seal.
Color changing ink
Like the bell in the inkwell, the ink on the number 100 at the bottom right of the bill changes from copper to green when we move it.
Source: Ambito