How To Check A $100 Bill?

Authenticity Marker
These are the pens you can use to do one test on currency.
Authenticity Pen Test
The ink stays mustard when it detects the specific paper used with currency. With regular paper it turns dark brown.

UV light USD Demonstration

I have been a teller at a bank for a year and a half now. There are a few ways one can check a $100 bill.

  1. Watermark
  2. Counterfeit marker test
  3. U.V. light test
  4. Texture (newer bills)
  5. Manual / Visual examination of bill
  6. Machine Test

The most well known is a water mark test. This is done by holding a bill up in front of a source of light to check for a hidden image. This image should be pretty clear and distinct, and not too displaced to one side.

Second, there are markers which use a special ink and can help determine currency paper vs ordinary paper (money is printed on a special paper). This is known as a counterfeit marker test. The ink will remain yellow or mustard if on a $100, or $50, but will turn dark brown on other types of paper. This is one of the quickest ways and can be seen at most retail stores.

Third, most currencies have a U.V. light feature. For the $100, a red line should be seen to the left side of the president. This can only be seen under a UV light.

Fourth, on newer blue bills there is a texture feature. Around the collar of the president if one runs there finger nail, the bill should be smooth and then the finger nail should feel a few small “bumps”

Lastly, there is a manual that most banks have on hand regarding foreign currencies, but the manual also explains visual checks for authenticity for American currency. This manual explains some of the test I mentioned here, as well visual checks detailing to look for repeated serial numbers, odd margins, clarity in printed text, clarity in print of the denomination, etc.

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