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“Looking for a versatile hidden message device?”
RubUps™ could be the solution!
RubUps™ are printed with invisible ink that flushes with color when rubbed briskly or heated. They can be used for educational quizzes, games, hidden discounts, or winning number games, etc. – even as heat indicators.
For more information: contact your local salesperson or call WS Packaging Group at 800-340-3424 ext. 6231.
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