Ned Ludd on sun 8 sep 02
N.B. my earlier post re Brongniart's Formula reached Clayart somewhat
truncated. The first few lines were missing, though it was sent
complete. Weird! Here it is again, corrected.
Hi Lily
Instead of taking all the time and trouble to render a wet glaze back
to bone dry in order to determine its dry weight, why not use
Brongniart's Formula?
What it does is determine the dry weight of the ingredients in a wet
slop: slip or glaze. To work the formula all you need is the relatve
density of the glaze, and an accurate volume of same. Take out your
electronic calculator and off you go.
The Hamer Dictionary has an comprehensive entry on Brongniart's
Formula: my copy is away at the studio, or I'd cite it here.
I'd be interested to learn if any other Clayarter uses this method.
best
Ned
Lily Krakowski wrote
>My suggestion--that WHILE LETTING THE GLAZE IN THE BUCKET DRY OUT ENTIRELY
>you make some tests. Straight line blends. Leave out all whiting in one
>test, all spar in another, all frit in a third.
>
>When the tests are done and the clay-in-bucket bone dry weigh the dried
>glaze so you can add the right amount of whatever. Good luck
>
>
>Steve Burtt writes:
>
>> Wonder if I could get a little help with a glaze problem? I made a
>>mistake when mixing a bucket of butterscotch and the result was
>>really nice, but I do not know what I did to it.
>>
>> Here's the original glaze: Butterscotch:
>> Custer Feldspar 28
>> Frit 3134 32
>> EPK 14
>> Silica 19
>> Whiting 7
>> Rutile 4
>>
>> This glaze makes a glossy, translucent butterscotch that gets
>>creamy and white when thick. The strange bucket that I made up came
>>out opaque, semi-glossy, and thick; did not go white when thick.
>> My original thought was that I used G200 instead of Custer,
>>but I did a test and G200 does not make a noticable difference.
>> I am perfectly willing to do some testing if someone can tell
>>me what I might have added too much or too little of.
> > Thanks.
> >
> > Steve Burtt
> > Ocean Springs, Mississippi
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