Gay Judson on sun 9 aug 09
Ron, I finally got out to the studio to run the little experiment you
suggested using vinegar with the little knots. I could not see any
fuming from the knots even with the magnifying glass. After a few
moments I rubbed the knots with my finger to try to break them up--but
they did not dissolve.
Could I have a bad batch of one of the materials? I got some 'bad'
strontium carb recently and ruined a batch of glaze with that.
I keep several big containers (~2 gallon) of distilled water in the
studio for my glaze making. However, on occasion I have found my
supply exhausted in the middle of mixing up glazes and used tap
water. That might have happened to this glaze--I don't remember that
it did and I am able to use distilled water 98%-99% of the time.
Perhaps this experience will train me to keep my glaze mixing notes
with observations for reference. I have not done that though I try to
keep lots of notes on firing--and even on loading--for reference later.
And your comments about this glaze not containing soluble materials
drives home the lessons learned (hopefully) from an earlier question
about why solubles are undesirable to use in glazes.
Again, thanks for your thoughts and for sharing them with me and the
list.
Gay Judson
On Aug 9, 2009, at 1:24 PM, Ron Roy wrote:
> Hi Gay,
>
> Me again - just wanted to ask everyone who has used that glaze - if
> it has ever happened to them. There are no solubles in that glaze
> and if distilled water was used I can't see how that could happen -
> anyone?
>
> RR
>
> On Sun, Aug 2, 2009 at 5:39 PM, Gay Judson wrote:
> I had mixed up a batch of "Clear Liner Glaze" from "Mastering Cone 6
> Glazes" a month or so ago. I've used it several times and am very
> happy with the glaze. BUT today when I passed it through a sieve
> before using it, there were little 'knots' left in the sieve. Hard
> knots that could not be broken down by rubbing with the brush or
> between my fingers. These little knots--like very small pebbles,
> about the size of pin heads--were not there before. I always sieve
> the glazes before use and have not encountered these little knots
> before.
>
> Do you know how they were formed in the bucket of glaze? The glaze
> had settled but was not hard-panned, it stirred up easily.
>
> And that brings to mind another mystery--maybe related. I've noticed
> that after glazes have sat in the plastic buckets for a time they will
> have 'eaten' into the side of the bucket--or attached to the bucket
> and can't be scrubbed out. It might be like the rings on the inside
> of glasses that have had water evaporate from them. (That is a
> calcium ring that dissolves with vinegar.) What is it that causes the
> rings in the plastic buckets? (I use distilled water to mix up my
> glazes because our water is so 'hard'.)
>
> Thanks for your thoughts.
> Gay Judson in San Antonio
>
>
>
> --
> Ron Roy
> 15084 Little Lake Road
> Brighton, Ontario, Canada
> K0K 1H0
Ron Roy on sun 9 aug 09
Hi Gay,
Me again - just wanted to ask everyone who has used that glaze - if it has
ever happened to them. There are no solubles in that glaze and if distilled
water was used I can't see how that could happen - anyone?
RR
On Sun, Aug 2, 2009 at 5:39 PM, Gay Judson wrote:
> I had mixed up a batch of "Clear Liner Glaze" from "Mastering Cone 6
> Glazes" a month or so ago. I've used it several times and am very
> happy with the glaze. BUT today when I passed it through a sieve
> before using it, there were little 'knots' left in the sieve. Hard
> knots that could not be broken down by rubbing with the brush or
> between my fingers. These little knots--like very small pebbles,
> about the size of pin heads--were not there before. I always sieve
> the glazes before use and have not encountered these little knots
> before.
>
> Do you know how they were formed in the bucket of glaze? The glaze
> had settled but was not hard-panned, it stirred up easily.
>
> And that brings to mind another mystery--maybe related. I've noticed
> that after glazes have sat in the plastic buckets for a time they will
> have 'eaten' into the side of the bucket--or attached to the bucket
> and can't be scrubbed out. It might be like the rings on the inside
> of glasses that have had water evaporate from them. (That is a
> calcium ring that dissolves with vinegar.) What is it that causes the
> rings in the plastic buckets? (I use distilled water to mix up my
> glazes because our water is so 'hard'.)
>
> Thanks for your thoughts.
> Gay Judson in San Antonio
>
--
Ron Roy
15084 Little Lake Road
Brighton, Ontario, Canada
K0K 1H0
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