What security feature appears and disappears and is usually used to protect photos?

What security feature appears and disappears and is usually used to protect photos?

• A. Hologram
• B. Microprint
• C. Overprint
• D. UV thread

Answer: (A)

This question tests recognition of an optical-variable security feature—one that changes appearance with light or viewing angle. A hologram fits this idea because the image or color shifts as you tilt or rotate the item, making parts of it seem to appear or disappear. That dynamic, angle-dependent quality is what makes holograms a reliable way to deter counterfeiting and to safeguard photos on official documents or identification. Microprint stays the same size and is only legible up close with magnification; it doesn’t rely on angle to reveal itself. Overprint is simply extra printing layered over another area and doesn’t inherently change with viewing angle. UV thread only reveals under ultraviolet light, not through ordinary viewing or angle changes.

This question tests recognition of an optical-variable security feature—one that changes appearance with light or viewing angle. A hologram fits this idea because the image or color shifts as you tilt or rotate the item, making parts of it seem to appear or disappear. That dynamic, angle-dependent quality is what makes holograms a reliable way to deter counterfeiting and to safeguard photos on official documents or identification.

Microprint stays the same size and is only legible up close with magnification; it doesn’t rely on angle to reveal itself. Overprint is simply extra printing layered over another area and doesn’t inherently change with viewing angle. UV thread only reveals under ultraviolet light, not through ordinary viewing or angle changes.