- Designed to turn opaque paper temporarily translucent, allowing the user to view the contents of an envelope without ever opening it
- Lasts approximately 30-60 seconds before returning envelope to original condition
- Leaves no markings or discoloration
- Each can treats several hundred square inches
- Warning: not to be used on U.S. mail, except by or with the express permission of the addressee
- 5oz. Spray can
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