In a message dated 10/04/05 14:14:48 GMT Daylight Time, zphoto@bellsouth.net
writes:
> Why would light hitting the surface harden the depths first
> and not the top?
..........................................
Chris, Possibly because the ''light'' is not light in the sense that is
usually thought of but ULTRA VIOLET RADIATION which will penetrate a top coat of
pigment etc.,and work on the sensitized substrate beneath. But, this is all
verbal theory. If it works.... it works!
Good luck with your tests. John Grocott-
Photographist.
Received on Sun Apr 10 11:08:39 2005
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