From: Judy Seigel (jseigel@panix.com)
Date: 05/14/01-03:20:03 PM Z
On Mon, 14 May 2001, zby wrote:
> 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.
>
There's a chemical called something maybe like bromocrysol is mixed with
a volatile solvent makes paper translucent, but I think plain acetone does
also, maybe even alcohol... temporarily.
Judy
> I wonder if anybody knows anything more about this substance. It could
> make problems with paper waxing "disappear".
> Ben
>
>
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