[pure-silver] Re: Chemical subsitution
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 27 Apr 2007 22:04:42 -0400
But why bother when the magnification is so easily calculated. At RIT I
studied optics, both under graduate and graduate, up to and including Born
and Wolf including physical optics, doing vibration analysis using
holography for General Electric during the summers but my last name tells
all. K I S S: keep it simple stupid. I calculated MANY entrance and exit
pupils using a nodal slide and they are OFTEN where you would least expect
them. Again, why bother when the magnification is so easy to calculate.
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of BOB KISS
Sent: Friday, April 27, 2007 9:59 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Chemical subsitution
DEAR RICHARD,
But this doesn't answer my question: Sodium Citrate was mentioned
instead of Citric Acid. Was that Doug or you mentioning Sodium Citrate in
Hypo Clear as you have made the point that Sodium Citrate is NOT mentioned
in the patent but citric acid is.
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Friday, April 27, 2007 8:07 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Chemical subsitution
----- Original Message -----
From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, April 27, 2007 5:56 AM
Subject: [pure-silver] Re: Chemical subsitution
> DEAR RICHARD,
>
> Well, as we say in Barbados, now I con-FUSED! In
> your e-mail below
> (was that your info or Doug Nishimura's info?) where it
> states that Hypo
> Clear is mostly sulfite and metabisulfite, it also states
> that, "Kodak has
> added a small amount of sodium citrate and tetra-sodium
> EDTA to bind-up
> unwanted metal ions effectively". Hmmmmmmmmm, is Doug
> wrong in his
> assessment that there is sodium citrate in hypo clear
> instead of the citric
> acid that you cited from the patent info? Please advise.
>
> CHEERS!
>
> BOB
>
> I am not sure where I got this originally but I found
>
> this searching rec.photo.darkroom using Google groups
>
> search.
The above is me speaking....
The copies message from Doug Nishimura starts here:
-----------------------------------------------------------------------
> Hypo clearing agent is mainly a mixture of sodium sulfite
>
> and sodium
>
> metabisulfite. The metabisulfite behaves very much like
>
> sodium bisulfite (as the
>
> Merck index says, "The bisulfite of commerce consists
> fixer and Kodak Fixer are a similar pair.
>
>
>
>
> -Doug
>
> Douglas Nishimura
>
> Research Scientist
>
> Image Permanence Institute
>
--------------------------------------------------------------\
And ends here with his signature.
Most of message snipped...
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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