invisible ink


Origin:
1675–85

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
invisible ink
 
n
a liquid used for writing that does not become visible until it has been treated with chemicals, heat, ultraviolet light, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Invisible ink is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a stew of meat, vegetables, potatoes, etc.
Example sentences
On the side of the card, there's invisible ink, and each card is bar coded.
Because of this a companion invisible ink exercise was developed for this same problem.
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