[pure-silver] Re: Borax
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 11 Jul 2013 10:26:28 -0700
----- Original Message -----
From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, July 11, 2013 8:58 AM
Subject: [pure-silver] Re: Borax
DEAR COR & JERRY,
Richard and I already posted the following.
Perhaps you have
missed the posts or chosen to ignore them but they make it
clear:
"The only time there can be a question as to the hydration
of the compound
in a formula is if it specifies Sodium Tetraborate which
can exist as either
the anhydrous or the decahydrate. If it specifies Borax
it is, by
definition, the decahydrate flavor."
Sodium Tetraborate is the chemical. Borax is a
popular brand
name which has become generic (like Kleenex) for the
decahydrate version of
Sodium Tetraborate. So if anyone says Borax they are
referring (whether
they know it or not) to the decahydrate version, not the
anhydrous version.
We all are all human and can make mistakes or mistaken
assumptions, even
those people who write formulae.
So Borax specifically means Sodium
Tetraborate-decahydrate. If
it says Sodium Tetraborate it can mean either the
anhydrous or the
decahydrate.
As has also been pointed out quite specifically
by Daniel
Bouzard, as it is used as a buffer in FX37 the difference
between the two
will make less than .1 or .2 units difference in pH,
insignificant in
photographic work. Further, someone else pointed out that
the anhydrous
flavor of Sodium Tetraborate is soooooooooooo hydroscopic
that it does not
remain anhydrous for very long so trying to use it is self
defeating.
CHEERS!
BOB
I think you will find that Kleenex is still a
registered trade-mark of Kimberly-Clark. Many trade names
have become generic because their owners did not diligently
protect them. In some cases the names were just released to
the public domain. Kodak was especially active in
protecting their trade names. At one time "Kodak" was in
danger of becoming a generic name for any portable camera,
Eastman Kodak kept after this. I can't cite specific suits
but probably a google search would find them. One example of
a trade name which was released to the public is
"Bass-Reflex" which refers to a patented type of loudspeaker
enclosure. The patent and trade mark were held by the Jensen
Company but were released for generic use sometime in the
1940s because it was so popular a name that they couldn't
protect it.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@xxxxxxxxxxxxx
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