i’m sure many of you have seen ads for sprays that let you see through envelopes. they’re called envelope x-ray sprays.
how does this work? and what’s this spray made of? i’ve read online that it’s made of a regular household product.
I know fats and oils will render most papers transparent, or at least nearly so. Of course the effect is not easily reversible, so I suspect that’s not what’s being used in these sprays. I’m finding plenty of site that sell it, but noe that reveal its ingredients. In any case, use of such a product would be illegal in the US if used on US mail.
I should add, if it’s not your mail and you don’t have the recipient’s express permission.
I saw it used on one of the consumer advicate shows. It does work. It uses (or used) some type of freon IIRC or trichloroetheline. It wets the paper but dried very fast. The thing is readable while wet and doesn’t rinkel the paper.
I tryed it with another fast dry cleaner and it was readable - try brake cleaner.
The sprays are labeled “non-flammable, non-conductive, photochemically non-reactive.” At least one site claims it’s found in grocery stores – I’m guessing it’s pump-style hair spray. Anyone wanna check it out?
(On preview, I see claims that it’s a chlorinated solvent; this makes sense, but the “non-reactive” claim kind of throws that – or not, depending on the honsety of the vendors)