Ken Moore on fri 6 dec 96
At 08:02 PM 12/4/96 EST, you wrote:
>----------------------------Original message----------------------------
>
>>Ken Moore wrote:
>
>> Can anyone tell me why the glaze on the inside of my goblets is so much more
>> beautiful than the same glaze on the outside of the same goblet?
>>
>
>I would guess that you glaze the insides of the goblets first. The bisque
>is drier and in soaking up more water leaves a thicker glaze
>application/covering on the insides. When you glaze the outsides the
>damper bisque will not hold the same thick coat of glaze as thee inside
>did.
>
>David McBeth, MFA
David,
If this were the case, wouldn't the stem of the goblet come out just as
gorgeous as the inside?
Julie Moore
Dirty Bird Pottery
Manassas, VA
kenmoore@pop.erols.com
LBCLAY@aol.com on sat 7 dec 96
Hello Ken,
My feelings as to why the glaze on the INSIDE of your goblets is more
beautiful than the glaze on the OUTSIDE of the same pot is because the Inside
of your goblets are more protected...just as the mugs (or whatever) in the
Middle of a shelf look better than most on the outside of the shelf...they
are protected from the immediate Flame, Heat, and all the other stuff that
goes on in there,,,
my humble opinion
ZALT@aol.com on sat 7 dec 96
Good question Julie;
You know the one thing that wasent memtioned in DM's question was ,what type
of firing was he doing? I believe that the distinction of the inside vs
outside only shows up on reduction firing. I have not noticed any difference
on the inside and outside surfaces in electric firing. Using this as a
rational I would have to say that the reduction gases build up on the inside
of the bowl and in turn help flux and reduce the glaze just a hint more than
the outside of the goblet. I noticed that when I was trying to obtain a
copper red that the inside of the cup was always better coloured than the
outside. I feel that the air currents caused by the draft move the
reduction gases too fast to allow a more complete reduction on the outside.
The gases on the inside do not move and thus have more time to act with the
oxides in the glaze.
I could be out in left field or maybe right field. Who cares maybe centre.
Terrance F. Lazaroff
St Hubert, Quebec, Canada !!!!
Andrew S Lubow on sat 7 dec 96
Just a stab in the dark. Since heat rises, the inside of the goblet would
retain heat longer since the outside "probably" cools faster. I suggest
the possiblity (if this is the case) the insides soak heat just a little
bit longer and it give the glaze the extra time it needs to become "more
beautiful". Just conjecture really.
On Fri, 6 Dec 1996 04:45:49 EST Ken Moore
writes:
>----------------------------Original
>message----------------------------
>At 08:02 PM 12/4/96 EST, you wrote:
>>----------------------------Original
>message----------------------------
>>
>>>Ken Moore wrote:
>>
>>> Can anyone tell me why the glaze on the inside of my goblets is so
>much more
>>> beautiful than the same glaze on the outside of the same goblet?
>>>
>>
>>I would guess that you glaze the insides of the goblets first. The
>bisque
>>is drier and in soaking up more water leaves a thicker glaze
>>application/covering on the insides. When you glaze the outsides the
>>damper bisque will not hold the same thick coat of glaze as thee
>inside
>>did.
>>
>>David McBeth, MFA
>
>David,
>
>If this were the case, wouldn't the stem of the goblet come out just
>as
>gorgeous as the inside?
>
>Julie Moore
>Dirty Bird Pottery
>Manassas, VA
>kenmoore@pop.erols.com
>
Gavin Stairs on mon 16 dec 96
This goes back a bit to a thread started by Julie Moore on Tue, 3 Dec 1996.
----------------------------Original message----------------------------
Can anyone tell me why the glaze on the inside of my goblets is so much more
beautiful than the same glaze on the outside of the same goblet?
Julie Moore
Dirty Bird Pottery
Manassas, VA
kenmoore@pop.erols.com
----------------------------------Reply---------------------------------
I'm just new to this stuff, so I would be interested in comments on the
following conjecture. My background is technical (I'm an engineer) which is
how I come to be so bold as to propose an answer - speculatively.
I don't know the original recipe, but I'd guess that the glaze is both high
in alumina and also high in some fairly volatile fluxes. My conjecture is
that the fluxes tend to boil off slightly. On the outside, they disperse
rapidly, but on the inside, they tend to hang about a bit longer, which
means that the rate at which the flux level lowers would be smaller on the
inside than the outside. Result: the higher fluxing on the inside would
produce a smoother and clearer glaze. It should also craze more easily, but
that may not show with the high alumina.
If this is right, you could probably "fix" it by reducing the fluxes on the
inside glaze. You'd have to glaze in two operations, rather than simply
dipping. But then, why would you want to fix it anyway? It sounds just
about right now, unless you want the smoother glaze on the outside too. In
that case, just increase the fluxes slightly. Or reduce the alumina.
I'd be interested to hear if this turns out right, or any comments.
Bye, Gavin
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