[alt-photo] Re: preserving gum arabic solution

[Paul Viapiano]

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
> _______________________________________________
> Alt-photo-process-list | http://altphotolist.org/listinfo