"Jean-David Beyer" wrote in message
news:5vQdi.3275$lY5.1258@trnddc07...
Richard Knoppow wrote:

One problem with Clerk is that there are no
attributions or
citations. Sulfite slowly absorbs oxygen becoming Sodium
Sulfate. In a
developer or fixing bath its affinity for oxygen is used
to protect
other chemicals by preferential absorption. Hydroquinone
and Metol are
also oxygen absorbers but, like you, I've never heard of
adding any
to a Sulfite solution to preserve it.
Generally, the more concentrated a sulfite solution
it the longer
it will last. Probably the best way to preserve a sulfite
solution is
to keep it in a closed, sealed container of some material
which does
not allow air to pass through. Glass is best but some
high density
plastics are nearly as good.
The various editions of Clerk's books have a lot of
good stuff
in them but, IMO, the lack of citations and references
severely limits
them.

The only copy of L.P. Clerc I have seen is an English
translation in two
volumes. These seem to be intended for English students
who want a career in
photography. I know some color illustrations (all of them)
are missing,
though referred to in the text. Could it be that a French
edition would
contain the citations? L.P.Clerc was a scholar, among
other things, and it
seems unlikely that he would have left out the citations.

--
.~. Jean-David Beyer Registered Linux User
85642.
/V\ PGP-Key: 9A2FC99A Registered Machine
241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 08:25:01 up 7 days, 13:25, 3 users, load average:
4.47, 4.26, 4.15

I have several editions of Clerk, all English
translations. The forward indicates that citations were
delibrately left out to reduce the size and cost of the
book. I am quite sure they didn't exist in the original
French editions. There are a few citations in the text,
mostly just to names, with no indication of where to find
them, so its very difficult to trace down original sources.
The first two or three editions were published in a
single volume. Then the book was taken over by Focal Press
who broke it up into several small books. Focal tends to do
this sort of thing. Clerk remains a valuable book but the
value is very much reduced by the lack of references.


--
---
Richard Knoppow
Los Angeles, CA, USA