U of S | Mailing List Archive | alt-photo-process-l | Re: concentration of 14 baume gum arabic

Re: concentration of 14 baume gum arabic

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: concentration of 14 baume gum arabic
  • From: Dirk-Jan Treffers <dirkjan.treffers@gmail.com>
  • Date: Wed, 03 Sep 2008 13:49:23 +0200
  • Comments: "alt-photo-process mailing list"
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thanx Loris, Kees,

These are some pretty fast answers!
I'll try both methods. At peter van ginkel, the limpus were sold ou,
so i went for the powder....


2008/9/3 Kees Brandenburg <ctb@zeelandnet.nl>:
> Hi Dirk-Jan,
> I have been mixing my own gum from lumps in a 35+100 (gum+water) ratio for
> years. When using lumps you can filter the solution by binding the lumps is
> a piece of cheesecloth and hang this in a jar with water. I am using a cheap
> winemakers hydrometer to measure specific gravity. A sg to baume conversion
> tool can be found here: http://www.ilpi.com/msds/ref/baumescale.html. This
> gum mix is at or around 14 beamé when measured! I tend to use a more
> concentrated (1+2) solution now.
> I buy my gum in the netherlans at  peter van ginkel artsupplies:
> http://www.petervanginkel.nl/index.php?id=1645
> kees
> On 3 sep 2008, at 12:50, Dirk-Jan Treffers wrote:
>> Dear list members,
>> does anyone know what concentration of (powdered) gum arabic in water
>> most likely will come close to 14 baume gum arabic that you buy in art
>> supply stores?
>> I've searched on the internet, but could not find a direct answer.
>> Maybe anyone here can help me out? I'm getting a bit sick of paying
>> rediculous prices for very small bottles, and have 1 kg of powdered
>> gum. When I mix it in a 1:1 ratio, the gum looks far more dark that
>> the regular solution, and I'm afraid that will taint my final
>> gumprint...
>> Anyone have any ideas on this matter?
>> thanks in advance!
>> cheers,
>> Dirk-Jan