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Aniline inks that are used to discourage forgeries and fraudulent erasures. They run when wet and are easily damaged by rubbing
http://www.esperstamps.org/terms2.htm
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Printing inks used in stamp production that easily fade or break up in water or chemicals. To counter attempts at forgery or the removal of cancellations, many governments have used fugitive inks to print stamps.
http://www.vistastamps.com/en/glossary2.html
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