Question 1

How does "chemically sensitive" paper prevent check fraud?

Accepted Answer

Chemically sensitive paper acts as a silent alarm against a process known as "check washing," where fraudsters use chemicals to erase the payee name or dollar amount. When these specialized chemicals touch the high security paper, it reacts by breaking out in spots, stains, or total discoloration. This immediate physical reaction makes it obvious to a bank teller or recipient that the document has been tampered with and is no longer valid.

Question 2

What is microprinting and how can it be used to verify a check?

Accepted Answer

Microprinting is a security feature where text is printed so small—roughly a tenth of a millimeter—that it appears as a solid line to the naked eye. On high security checks, signature lines or decorative borders are often actually strings of tiny, repeated words like "AUTHORIZED SIGNATURE." Because standard photocopiers and scanners lack the precision to replicate these individual letters, a counterfeit check will show a blurred or solid line under magnification instead of clear, legible text.

Question 3

What is the difference between Positive Pay and Reverse Positive Pay?

Accepted Answer

Positive Pay is an automated digital service where a business sends a "guest list" of issued checks (including check numbers and amounts) to the bank; the bank then only honors checks that match this list. Reverse Positive Pay is a more manual, budget-friendly version where the bank does not have a pre-approved list. Instead, the bank notifies the account holder of every check presented for payment that day, and the account holder must manually review and approve them, often under a very tight morning deadline, or the bank will pay them automatically.

Question 4

How does a "Void Pantograph" trap someone trying to photocopy a check?

Accepted Answer

A Void Pantograph is a complex background pattern that looks like a solid color or a simple design to the human eye. However, it contains hidden dots of a slightly different size or color that spell out the word "VOID." While the human eye blends these subtle differences together, a photocopier cannot process them correctly and over-emphasizes the hidden pattern. Consequently, any copy made of the check will have the word "VOID" clearly visible across the front, rendering the duplicate useless.

Question 5

Why is the MICR line at the bottom of a check printed with magnetic ink?

Accepted Answer

The MICR (Magnetic Ink Character Recognition) line contains account and routing information printed in a specialized magnetic ink that creates a unique electrical pulse or "waveform" when read by bank sorting machines. This allows banks to verify the check's authenticity through "feeling" the ink's magnetic signature. If a fraudster prints a check using a standard home inkjet or laser printer, the ink will have no magnetic properties, causing the machine to flag the check for manual inspection.

Check security features and the fight against fraud

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