Laura Freedman on fri 13 aug 99
I tested purple icing and got a beautiful purple glaze. Decided to make a
big batch and must have goofed somewhere. Got a beautiful purple but it is
very rough to the touch and not smooth as the test. Coverage is fine. Can
anyone in glaze land give a helping hand as to a cure for this large pot of
glaze?
Is this glaze food safe? It doesn't look harmful but I sense that larger
quantities of harmless chemicals can make a difference.
Purple Icing ^6
Gerstley 6.2
Lithium Carb 2.0
Magnesium Carbonate 6.1
Strontium Carbonate 12.6
Whiting 12.1
Nepheline Syenite 21.0
Flint 40.0
Add:
Tin Oxide 3.0
Cobalt Carbonate 1.0
Rutile 3.6
Bentonite 2.0
Second question. If you have a ^7-10 glaze such as Berry Rust and it does
well at ^6, 7, in oxidation, will it mature at ^10 in a reduction
atmosphere too? If not, what material in the glaze makes the difference
between oxidation and reduction?
Laura in hot, humid PA, waiting for the rainstorm they keep promising.
Ron Roy on sat 14 aug 99
This glaze, as it is, should melt just fine at cone 6 - it is seriously
short of alumina and there is no clay in the recipe except for the
bentonite. This is a mystery to me.
I would need the recipe of the Berry Rust to try and answer your 2nd
question. You could try a small test inside a bowl to see what would
happen.
RR
>----------------------------Original message----------------------------
>I tested purple icing and got a beautiful purple glaze. Decided to make a
>big batch and must have goofed somewhere. Got a beautiful purple but it is
>very rough to the touch and not smooth as the test. Coverage is fine. Can
>anyone in glaze land give a helping hand as to a cure for this large pot of
>glaze?
>Is this glaze food safe? It doesn't look harmful but I sense that larger
>quantities of harmless chemicals can make a difference.
>
>Purple Icing ^6
>
>Gerstley 6.2
>Lithium Carb 2.0
>Magnesium Carbonate 6.1
>Strontium Carbonate 12.6
>Whiting 12.1
>Nepheline Syenite 21.0
>Flint 40.0
>Add:
>Tin Oxide 3.0
>Cobalt Carbonate 1.0
>Rutile 3.6
>Bentonite 2.0
>
>Second question. If you have a ^7-10 glaze such as Berry Rust and it does
>well at ^6, 7, in oxidation, will it mature at ^10 in a reduction
>atmosphere too? If not, what material in the glaze makes the difference
>between oxidation and reduction?
>
>Laura in hot, humid PA, waiting for the rainstorm they keep promising.
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
Laura Freedman on sun 15 aug 99
Ron, thanks for answering. The test glaze for the purple icing is fine and
I must have made a mistake when I made the large batch. I'm trying to
salvage that batch. Someone mentioned to me that I might have added too
much whiting and that had given the Purple Icing the roughness. Can I fix
it and how should I attempt to do it? At this point the glaze is worthless
to me. Any suggestions would be helpful. As for the Berry Rust question I
will send that later when I get to my notes. Thanks
>----------------------------Original message----------------------------
>This glaze, as it is, should melt just fine at cone 6 - it is seriously
>short of alumina and there is no clay in the recipe except for the
>bentonite. This is a mystery to me.
>
>I would need the recipe of the Berry Rust to try and answer your 2nd
>question. You could try a small test inside a bowl to see what would
>happen.
>
>RR
>
>>----------------------------Original message----------------------------
>>I tested purple icing and got a beautiful purple glaze. Decided to make a
>>big batch and must have goofed somewhere. Got a beautiful purple but it is
>>very rough to the touch and not smooth as the test. Coverage is fine. Can
>>anyone in glaze land give a helping hand as to a cure for this large pot of
>>glaze?
>>Is this glaze food safe? It doesn't look harmful but I sense that larger
>>quantities of harmless chemicals can make a difference.
>>
>>Purple Icing ^6
>>
>>Gerstley 6.2
>>Lithium Carb 2.0
>>Magnesium Carbonate 6.1
>>Strontium Carbonate 12.6
>>Whiting 12.1
>>Nepheline Syenite 21.0
>>Flint 40.0
>>Add:
>>Tin Oxide 3.0
>>Cobalt Carbonate 1.0
>>Rutile 3.6
>>Bentonite 2.0
>>
>>Second question. If you have a ^7-10 glaze such as Berry Rust and it does
>>well at ^6, 7, in oxidation, will it mature at ^10 in a reduction
>>atmosphere too? If not, what material in the glaze makes the difference
>>between oxidation and reduction?
>>
>>Laura in hot, humid PA, waiting for the rainstorm they keep promising.
>
>Ron Roy
>93 Pegasus Trail
>Scarborough, Ontario
>Canada M1G 3N8
>Tel: 416-439-2621
>Fax: 416-438-7849
>
>Web page: http://digitalfire.com/education/people/ronroy.htm
>
>
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