Ron Roy on wed 7 may 03

I checked out both these glaze - the Kemp 5 is a matte glaze - it has
enough alumina and silica but may not be a stable glaze becasuse it is
probably not melted enough.
I don't know where the pink spots are coming from but it is high in sodium
and zinc.

The 1st glaze is a crystaline glaze but is probably grossy unstable because
there is so little alumia and silica - try the lemon test on this one - not
the best kind of glze to use on the inside of functional pots.


RR

>Wesley, Here is a recipe with different ingredients that looks just like
>Kemp 5 if that gives you a clue. Since the "flecks" get larger with halos
>when it is fired in a crystalline schedule I always concidered it
>simi-crystalline.
> 30% Custer Spar
>14 % whiting
>14 % dolomite
>10 % zinc
> 3 % lithium carb.
>25 % silica
> 5 % rutile

>
>> In Brian Kemp's Glaze - Kemp 5 - soft green with pink Fleck
>> (see below)
>> What causes the pink fleck?
>> and what is it's main function in the glaze?
>> All help would be appreciated.
>>
>> Thanks,
>> wesley
>>
>> Glaze Name: Kemp 5
>> Cone: 6 - 7
>> Color: soft green w/ pink flecks
>> Surface texture: Shiny or Glossy
>> Date: 1/26/95
>>
>> Recipe: Percent Batch
>> Nepheline syenite 67.0 67.00
>> Dolomite 10.0 10.00
>> Kaolin 8.0 8.00
>> Silica 9.0 9.00
>> Zinc oxide 6.0 6.00
>> Totals: 100.0 % 100.00 g
>>
>> Also add:
>> Copper carbonate 3.0 3.00

Ron Roy
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