[pure-silver] Re: For Sale 5-28-10
- From: harry kalish <hksvk@xxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 31 May 2010 15:31:07 -0400
Thank you, Richard.
On 5/29/10 7:59 PM, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "Ronald Klein" <rskmd83@xxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Saturday, May 29, 2010 5:32 AM
> Subject: [pure-silver] Re: For Sale 5-28-10
>
>
>> Any thoughts on how long the shelf life of hypo or F6
>> fixer would be in
>> containers with floating lids? Just purchased two five
>> gallon plastic
>> containers with lids.
>
> Kodak states that the life of F-6 is as follows:
> Open tray: 1 week
> Gallon tank: 2 months
> Stoppered bottle: @65F 3 months
> " " @75F 3 weeks
> Capacity is stated to be 150 8x10 prints per gallon but
> this is very optimistic and will not produce archival
> fixing. This is somewhat greater capacity than F-5 which is
> given as 100 sheets of 8x10, not stated whether paper or
> film.
> The life of F-6 is somewhat longer than F-5 except in
> stoppered bottles at low temperature where it is the same.
>
> Of course the life with a floating lid depends largely on
> how well the lid seals but they usually let some air in. The
> main limit of hypo life is the oxidation of the sulfite. The
> sulfite keeps the acid from decomposing the thiosulfate so
> if enough sulfite is oxidized the thiosulfate will also
> oxidize forming other sulfur compounds. Usually the hypo
> will become milky and eventually the sulfur will come out of
> solution and also smell.
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
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