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invisible ink

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Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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invisible ink  
n.  Ink that is colorless and invisible until treated by a chemical, heat, or special light. Also called sympathetic ink.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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