From: Thor Bols (thorbols@hotmail.com)
Date: 05/14/01-09:47:21 AM Z
Many solvents perform this same function. I recall, while working in a
machine shop, a "degreaser" that would make paper transparent, but then
would evaporate leaving no trace. As I recall, it didn't last long - not
long enough for an contact exposure. And I'm sure it was carcinogenic!
>From: zby <zby@eudoramail.com>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: AltPhoto <alt-photo-process-l@sask.usask.ca>
>Subject: See-through paper spray
>Date: Mon, 14 May 2001 10:19:55 -0500
>
>Yesterday, flying back from England aboard British Airways plane I saw
>BBC news clip about the new tool for law enforcement agencies that makes
>it possible to check contents of letters through paper envelopes.
>It is a spray (small aerosol can) that makes paper transparent.
>They showed a photograph placed inside the brown paper envelope. After
>spraying the envelope the photograph became clearly visible. After a
>while, the substance dries away without leaving any visible trace.
>According to this news clip, this stuff is available only to police etc.
>
>I wonder if anybody knows anything more about this substance. It could
>make problems with paper waxing "disappear".
>Ben
>
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