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This is how a store clerk explained it to me when I asked the same question: They "mark" the bills with a special marker to determine if the the bill is counterfeit. If the bill is legit, the marker does not put a mark on it, but if it is counterfeit, the marker will leave a streak.

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Q: Why do store clerks mark US Currency with a marker?
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How does the marker that's used to check money to see if it's counterfeit or not?

The marker pen used to check currency will leave a black mark on the note if it is counterfeit. The marker pen works by checking the pH level of the bill or by testing for certain chemicals that should be present or absent from paper currency. For example, counterfeit cash may be produced on paper that has starch in it and rubbing the pen on the fake bill will leave a black mark. US currency is made from a cotton based fiber and contains no starch.


How do you mark down prices with labels?

You mark it with a marker.


How do you mark off the area to be searched?

you put a marker called a diploma marker.


How many syllables are in marker?

The word marker has two syllables. Mark-er.


What symbol on a regualtory marker is used to mark a no wake or idol speed area?

A circle marker is a symbol on a regulatory marker that is used to mark a no wake or idle speed area.


What currency was in Germany before the Euro?

Deutsche Mark preceeded the Euro as the currency in West Germany


Why was the permanent marker invented?

To mark things permanently.


What is the standion?

It is a marker used to mark underground facilities.


What kind of marker to use on CD?

A permanent marker is a typical writing tool to mark labels on optical media.


If you write with a permanent marker on an egg when the egg hatches will the chicken have that mark on itself?

No, The mark is on the shell.


When did Germany change their currency from mark to saufeno?

There is no such currency as the "saufeno"!The Deutsche Mark, was the official currency of Germany from 1948 to 2001. Since 2002 Germany has used the Euro (€).


What was the currency used in Germany before the Euro?

Before the Euro was introduced to Germany, their currency was the Deutsche Mark. There were 100 Pfennings in a Deutsche Mark.