[alt-photo] Re: preserving gum arabic solution

[Tomas Sobota]

I prepared a gallon of gum some 27 years ago, and dropped a couple of
crystals of thymol in it, less than a gram. The crystals don't dissolve in
the gum, but float on the surface, forming an antiseptic atmosphere. The gum
has darkened considerably but is still perfectly usable. In my opinion
there's nothing to gain splitting the stock in smaller recipients.

Tom Sobota

On Thu, Jun 17, 2010 at 10:39 PM, Paul Viapiano <viapiano at pacbell.net>wrote:

> So...what does Daniel Smith or the Formulary use in their gum for
> preservation? Hmmm...
>
> I just bought a gallon of DS gum. Also wondering if I should decant that
> into smaller containers?
>
> Paul
>
>
>
> ----- Original Message ----- From: "Loris Medici" <mail at loris.medici.name>
> To: <noisy at rogers.com>; "The alternative photographic processes mailing
> list" <alt-photo-process-list at lists.altphotolist.org>
> Sent: Thursday, June 17, 2010 1:12 PM
> Subject: [alt-photo] Re: preserving gum arabic solution
>
>
>
>  As another option (for the O.P.):
>>
>> I use sodium benzoate, 0.5 per 100g of dry gum.  (I'm sure it would work
>> well if I was using even less, but then it gets harder to weight - since I
>> mix no more than 500-600ml of stock solution at once, therefore, I use the
>> it in excess. No adverse effects noticed in the past 2-3 years...)
>>
>> Regards,
>> Loris.
>>
>>
>> On 17.Haz.2010, at 23:03, Ian Hooper wrote:
>>
>>  Thymol has been working for me.
>>>
>>> 1 gram thymol dissolved in 5 ml alcohol.
>>>
>>> A few drops of that solution has kept a litre of gum fresh for 6 months
>>> so
>>> far (at room temp).
>>>
>>> -Ian
>>>
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