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Remember Yes & Know Books? The Beloved Invisible Ink Puzzles Are Making a Triumphant Return
From the 1970s through the early 2000s, these clever quiz books, with their magical invisible ink reveal format, were a staple in homes and stores nationwide, offering hours of independent play.
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This book can be read only when it’s wet
It was printed with a special hydrochromic ink that is invisible to the naked eye and becomes ... but the Dehydrating Book ...