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invisible writing ink |
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invisible writing ink [in′viz·ə·bəl ′wrīd·iŋ ‚iŋk]
(graphic arts) Ink that remains invisible until the color is brought out by the application of heat or chemical; made with sal ammoniac or salts of metals. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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