Envelope X-ray Spray Want to know what's inside an envelope ? Envelope X-RAY Spray turns opaque paper temporarily translucent, allowing the user to view the contents of an envelope without ever opening.  30 seconds after application, the envelope will return to its' original state, leaving absolutely no markings,  discoloration or other indications of use. Each can treats several hundred square inches. Non-conductive and non-photochemically reactive. Environmentally-friendly (contains no Freon).  Net weight: 8 oz.  WARNING: Not to be used on U.S. Mail, except by or with the express permission of the addressee. * Ground only  - Cannot ship by Air. Envelope X-ray Spray Item : 2035 ----------------------------- Price : $ 55.00