[Alt-photo] Re: lump gum

[Jorj Bauer]

Thyme oil might work. Don't know what impurities might come with it. The stuff at the drug store is generally just thymol in alcohol. 

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On Oct 19, 2013, at 12:00 PM, Laura V <laura at lavatop.com> wrote:

> Oh I see, so maybe at the drug store. I didn't know what it was. I read that it is derived from thyme, so maybe thyme oil would work as well? Thanks!
> 
> Laura
> 
> On 10/19/13 3:46 PM, Jorj Bauer wrote:
>> Glyoxol is a hardener. You probably don't want to use that as a preservative for gum.
>> 
>> Thymol should work. I'd be surprised if you couldn't find that; it's commonly used as an anti-fungal for finger- and toe-nails.
>> 
>> -- Jorj
>> 
>> On Oct 19, 2013, at 11:40 AM, Laura V <laura at lavatop.com> wrote:
>> 
>>> Thanks for this. I have not used a preservative before (mainly because I don't know where to buy it). I usually just mixed a small batch (when I had the powdered stuff) and kept it in the fridge and used it within 2 weeks.
>>> 
>>> Unless, is glyoxol a preservative? I have some that I used in paper sizing. It would be handier to always have the gum pre-mixed.
>>> 
>>> Laura
>>> 
>>> On 10/19/13 3:01 PM, Guido Ceuppens wrote:
>>>> Laura,
>>>> 
>>>> I used the following procedure with lumps of gum:
>>>> 
>>>> 300 grs of gum are slowly dissolved in 850 ml of cold water, this may take
>>>> several days. The impurities are then filtered or fished out, some
>>>> recommend to suspend the lumps of gum in a muslin bag to prevent the
>>>> impurities to float in the solution. Once dissolved a preservation agent
>>>> must be added to the solution: in the past I have added either 15 ml of
>>>> formol or 7.5 grs of sodium benzoate. I have used the thus prepared gum for
>>>> years without it going bad (I mainly use casein now but occasionally use
>>>> gum that was prepared from powder –same procedure- 7 years ago).
>>>> 
>>>> Welcome back and good luck,
>>>> 
>>>> Guido
>>>> 
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