[pure-silver] Re: paper speed variation

What an interesting suggestion about paper aging, that it starts from the
date you open it rather than the date of manufacture.

On Saturday I opened a box of grade 4 Ilfospeed that has been sitting around
at ambient temperatures since I bought it some time between 1981 and 1984.
(I don't remember why I bought it, because I only ever seemed to use grade 2
or 3 fibre based paper).  Over about 25 years it has probably dropped a
grade in contrast, but it still seems quite fast in Bromophen, with no fog
at all .

Don Sweet

----- Original Message ----- 
From: "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, April 16, 2008 1:53 AM
Subject: [pure-silver] Re: paper speed variation


> "Shannon Stoney":
> > I have a new box of 5x7 ilford multigrade
> > warmtone glossy paper.  I also have an
> > older box of the same paper in 8x10 size.
> > The 5x7 paper is at least a stop faster
> > than the 8x10 paper.
>
> Perfectly normal. I find paper loses 1/2
> a stop and 1/2 a grade over the first
> 6 months of use.
>
> > I don't know when it was made
>
> As near as I can tell, opening the box and letting
> air get at the paper starts the process - a few
> sheets left in a paper safe age very quickly.
> Unopened boxes keep their speed.
>
> You need the date the paper was opened, not
> made.  Not that it will do you any good ...
>
> I am sure the manufacturing date does have
> some influence.
>
> > Does this happen very often?
>
> All the time.
>
> Why does it happen?  I haven't a clue.
>
> ==
> Nicholas O. Lindan
> Cleveland Engineering Design, LLC
> Cleveland, Ohio 44121
>
>
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