Trivia

Hard

The Security Feature Wherein “VOID” Appears On Photocopied Documents Is Called A?

Pantograph
Copyblock
Photobar
Refractory
An illustration of copy-evident document security.
John R. Volpe/Google Patents

Answer: Pantograph

Many documents contain a hidden message that only appears when photocopied. This message, found on checks, birth certificates, prescription slips, and other documents prone to fraudulent reproduction is known in the printing industry as a “void pantograph”. It is named such as the most commonly used word is “VOID” and the term pantograph is a Greek term that means copy writing.

While the methods by which void pantographs are created vary, some printers use off-set patterns of tiny perpendicular lines while others use tiny dots; the mechanism of action relies on the limitations of the photocopying process. While photocopiers do a pretty great job of making copies of simple text and even photographs, they function as a type of low-pass filter for certain patterns. When you make a copy of the security-marked document, the invisible-to-the-human-eye words appear clearly in the copy.

Trivia

Hard

The First Widely Adopted Copy Machine Came With Which Of These Unusual Accessories?

Trivia

Hard

What Was The First Volunteer Distributed Computing Project?

Trivia

Easy

Which Modern Day Actor Landed A Role Portraying His Very Distant And Famous Cousin?

Trivia

Hard

Which Movie Featured A Different Ending Depending On Which Theater You Saw It In?

Trivia

Hard

The Point On The Earth’s Surface Farthest From Its Center Is Located At?

Trivia

Hard

Which Iconic Movie Prop Took A Trip To The International Space Station?

Trivia

Easy

Where Is The World’s Largest LAN Party Held?

Trivia

Hard

The Largest City Not Located On A Lake, River, Or Coastline Is?

Trivia

Easy

Which Computer Keyboard Key Is An Archaic Reference To Its Original Mechanical Function?