Alisa and Claus Clausen on tue 8 aug 00
Dear Gene,
When I add the water to glaze I start with a "little litre" to every =
1000grms. If I mix up 5000 grms. for example I first put 5 short litres =
water in a bucket and add the glaze on top handful at time, stopping to =
mix frequently.
I use a common kitchen dish brush to mix up the slurry. Then I sieve =
the thick mixture through a 60 mesh sieve. I use the knucke test. I =
take off my rubber gloves and dip my forefinger knuckle in the water and =
see how thick it clings to my skin. Usually all too thick at this =
stage.
I add a half a litre of water at time, usually only up to one litre, and =
repeat the test. Most of my glazes I use are good consistency when they =
cover my knuckle and I can see the wrinkle of my finger through the =
drying glaze. Wear a proper mask in a well ventilated area please.
Many glazes have different properties depending on how thick you apply =
them. Some glazes too thick or thin are seen as a fault, other users =
will see it as an effect. Personal. However, in general terms for a =
glaze that covers evenly and has a smooth surface, I use the above =
indication on my knuckle to judge the thickness of the glaze. You may =
have to reconsider again if you are overlapping glazes. My experience =
with clear glazes is that I mix them thinner than the others.
To some, this method is all too haphazard. There is an instrument =
called a hydrometer that measures a glazes viscosity. If you are using =
a premixed dry glaze, you could get get the proper measurent from the =
supplier. Otherwise, mixing from raw materials, you may have to mix =
thinner and thicker and test it and find the best results for your use. =
Be sure that the glaze is well mixed before you measure the viscosity. =
Do not add water to the top of the bucket and measure before blending =
because obviously your reading will be incorrect.
A short and less technical story about mixing glazes.
Best regards and good luck,
Alisa in Denmark.
-----Oprindelig meddelelse-----
Fra: Arnolds Home Improvements
Til: CLAYART@LSV.CERAMICS.ORG
Dato: 7. august 2000 12:10
Emne: need help with glazes
>i am new to pottery only 6 months. i have just this week mixed dipped =
and
>fired my first glaze that was not a ready mix. i used a cone 6 =
oxidation
>glaze i found in the archives saffire blue. as a beginner that lives an =
hour
>and a half from the nearest potter i have nothing to use as a reference =
or
>ask questions to, so here are my problems. how much water do i need to =
put
>in the glaze? how do i know when i have added enough water is there a =
simple
>test? the first batch i mixed was too thick and ran off my pots onto =
the
>shelves the second batch was too thin and hardly had any blue at all =
mostly
>green. i have read books the problem with the books are they are =
written as
>if you have potting and glazing all your life. to say the least i need =
some
>help!!!!
>i need help in a way that a beginner can understand. also i need a high
>gloss clear no gb cone 6 ox . i would be most grateful for any help!!!
>Gene Arnold
>mudduck@advi.net
>
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