Re: PYRO part B
Richard Knoppow (dickburk@ix.netcom.com)
Sun, 08 Feb 1998 13:15:02 -0800
At 01:40 AM 2/8/98 -0800, Francesco Curcio wrote:
>Richard Knoppow wrote:
>
>> This is the first I've heard that Kodalk is unstable or had bad keeping
>>properties. What exactly happens to it?
>
>I translate from the book by Ghedina, O.F. Foto Ricettario [Photo
Formulary],
>Hoepli Milano 1982 (fifth ed.), p.624:
>
>"Sodium Metaborate Na2B2O4 . 4H2O:...It must be stored in tightly sealed
>containers, because in the open air it looses crystallization water
>and combines with atmospheric gases [CO2?] changing into Borax
>and Sodium carbonate"
>
>I cannot judge if and how much this could really happen.
>Though Kodalk (renamed Balanced Alkaly by Kodak) is usually assumed
>to be equivalent to Sodium Metaborate, I wouldn't be sure it has
>exactly the same formulation.
>
>Francesco Curcio
>Milano Italy
>
>
>
Thanks to all of you who have replied, both on and off list,
to this.
----
Richard Knoppow
Los Angeles,Ca.
dickburk@ix.netcom.com