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sympathetic ink

noun
1.
a fluid for producing writing that is invisible until brought out by heat, chemicals, etc.; invisible ink.
Origin
1715-1725
1715-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sympathetic ink

sympathetic ink

noun
1.
another term for invisible ink
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for sympathetic

23
24
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