U of S | Mailing List Archive | alt-photo-process-l | Re: Stock Paint:Gum Solutions?

Re: Stock Paint:Gum Solutions?

Hi Kees (and others),

When you're tired of converting the hydrometer results to baumé:
in the better cooking shops, you can find baumé meters that are used for measuring the syruppy of sugar-melts/caramel kind of mix..
I bought mine for about 7 euro's :-)
My 30% gum solution (30 grams gumbrick dissolved into 100 ml distilled water) turned out to be 13 baumé


2008/10/23 Kees Brandenburg <ctb@zeelandnet.nl>
Hi Marek,

That's a bit confusing. When I measured my former mix (1 part gum + 3 parts water) some year ago when Chris asked us about our gum mixes it turned out to be near 14 baumé. Now I use a heavier 1 part gum + 2 parts water mix.

As I have both concentrations at hand I just (re)measured both mixes with my simple winemakers hydrometer.

these are the results:

My 1+3 mix has a specific gravity of 1.101 this is 13,3 baumé
My 1+2 mix has a specific gravity of 1.132 this is 16,9 baumé

You can lookup the baumé grades here:  http://ilpi.com/msds/ref/baumescale.html

And some pictures from the lab: http://polychrome.nl/techlog/gum-concentration


On 23 okt 2008, at 16:40, Marek Matusz wrote:

I use 14 baume ready gum solutions (about 30% as I recall), so it is the same as yours 1:2.