invisible ink - meaning and definition. What is invisible ink
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What (who) is invisible ink - definition

SUBSTANCE USED FOR WRITING WHICH IS INVISIBLE AND CAN LATER BE MADE VISIBLE
Disappearing ink; Invisible writing; Lee magic pen; Infrared dye; Sympathetic ink; Uv ink; Secret ink; Lemon juice as invisible ink; UV ink
  • A US$20 bill showing a visible stripe under an ultraviolet light

invisible ink         
¦ noun a type of ink used to produce writing that cannot be seen until the paper is heated or otherwise treated.
India ink         
  • ''[[Cryptococcus neoformans]]'' stained with light India ink
  • Inkmaking from pine wood, as depicted in the ''Tiangong Kaiwu'' (1637)
  • A solid [[ink stick]] used for the preparation of ink
SIMPLE BLACK OR COLORED INK
Encre de chine; China ink; Chinese ink; India ink stain; Indian ink; India Ink; Black ink; Masi (india ink)
India ink (British English: Indian ink; also Chinese ink) is a simple black or coloured ink once widely used for writing and printing and now more commonly used for drawing and outlining, especially when inking comic books and comic strips. India ink is also used in medical applications.
India ink         
  • ''[[Cryptococcus neoformans]]'' stained with light India ink
  • Inkmaking from pine wood, as depicted in the ''Tiangong Kaiwu'' (1637)
  • A solid [[ink stick]] used for the preparation of ink
SIMPLE BLACK OR COLORED INK
Encre de chine; China ink; Chinese ink; India ink stain; Indian ink; India Ink; Black ink; Masi (india ink)
¦ noun North American term for Indian ink.

Wikipedia

Invisible ink

Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means, such as heat or ultraviolet light. Invisible ink is one form of steganography.

Examples of use of invisible ink
1. They did discover, however, that Larsen sent messages in invisible ink in letters to his wife.
2. There were no signs of invisible–ink pens, digital voice recorders or fun counterterrorism gadgets in the boxes.
3. Some think the paper had a special solution on it, similar to this recipe for invisible ink.
4. Food scientists have developed an invisible–ink logo which appears in black on the shell when the egg is done.
5. SANTA ANA, Calif. –– The inmates had to heat the letter to draw out the message, written in invisible ink.