Shomer-Tec Envelope X-Ray Spray Envelope X-RAY Spray turns opaque paper temporarily translucent Allows the user to view the contents of an envelope without ever opening it The envelope will return to its original state, leaving absolutely no markings, discoloration, or other indications of use contains no Freon WARNING: Not to be used on U.S. Mail, except by, or with the express permission of, the addressee Envelope X-RAY Spray turns opaque paper temporarily translucent Allows the user to view the contents of an envelope without ever opening it The envelope will return to its original state, leaving absolutely no markings, discoloration, or other indications of use WARNING: Not to be used on U.S. Mail, except by, or with the express permission of, the addressee