Artificial Watermark
A printed pattern or symbol using inks with no tonal value (usually off-white, white opaque, transparent, reflective or oil-based inks) that only appears when the substrate is tilted to normal light and/or transmitted light.
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Blind Embossing
A colorless relief image or raised impression made without use of inks or foils.
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Copy-Evident Background
A pattern designed into the printed background which becomes visible when photocopied or scanned.
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Deliberate Error
An intentional printing mistake known only to the manufacturer and inspection officials. Typically, seen as a single event in a repeating sequence, in an attempt to trip-up criminals who try to recreate the image.
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Dropout
An image visible under normal lighting conditions, but disappears under an alternate light source.
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Duplex Patterns
A design made up of an interlocking pattern or irregular shapes, printed on opposite sides of the substrate. The images when viewed with transmitted light, creates one complete and registered image.
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Embossing
The process of creating a raised image into the substrates surface, using either a set of male/female dies or engraved plates/cylinders and magnetic flexible dies under high pressure. Tactile elements can also be created using specialty inks and/or thick layers of inks to create a raised image.
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Guilloche Pattern
An intricate pattern of overlapping, continuous colored lines.
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Latent Image
An image or pattern created with raised lines placed at a right angle (90 degrees) from the background, so that when viewed at an oblique angle the image is visible through light and shadow effects.
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Line Screen Modulation
A method of digitizing halftone images, creating irregular spacing between lines or dots. When scanned or copied using normal frequencies the scanned image reveals a moiré pattern. Can be used in combination with a lens or filter to reveal a hidden image.
