[pure-silver] Re: acrchival wash in cold water?
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 15 Apr 2011 16:01:53 -0700
----- Original Message -----
From: "Eric Nelson" <emanmb@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, April 15, 2011 3:38 PM
Subject: [pure-silver] Re: acrchival wash in cold water?
Good luck with the plumber. Good ones are worth it but
the less the tradesman's entrance is used the better:-)
Richard Henry did some experimentation with washing out
of brighteners. By memory he found that some washed out
quickly but then slowed down a lot so some brightener stays
in the paper even after long washes. I don't know exactly
what the brightener is or how it bonds with the support or
substrate so I have no idea of by what mechanism it washes
out. To be effective it must be in the substrate layer
rather than in just the support. The substrate, either
baryta of conventional paper or the plastic of RC paper,
must be what glows for the image to be brighter. BTW, papers
with brighteners will look different under incandescant
light where there is not much UV to excite it than in
daylight or fluorescent light. A paper like the late,
lamented, Kodabromide, which has no brightener, looks the
same under all types of light where modern RC papers don't.
Also, tinted paper in general does not have brightener in
it.
I suspect this stuff is similar to the "blueing" sold
for laundry purposes.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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