Heloisa Nunes on thu 17 nov 05
Thank you for everybody's input . I will try another recipe because this one
seems to be off somehow.
I will unload my first electric C6 firing today, and I am really excited!!!!
As soon as I can get pictures on the internet, I will post them!!
Heloisa Nunes
Sao Paulo,
Brazil
----- Original Message -----
From: "Ron Roy"
To:
Sent: Monday, November 14, 2005 4:45 PM
Subject: *VERIF.SPAM*(5.5)*(5.5)* Re: Tea Dust recipe??
> Hi Heloisa,
>
> I will not melt at cone 6 or 7 - it would need some boron or zinc - and
> the
> alumina is way high - one of the criteria for stability depends on a
> certain amount of melting.
>
> I will also craze on most clay bodies.
>
> Adding more iron and cobalt will not help the melt in oxidation anyway.
>
> On the other hand - nothing particularly toxic in it but it will change
> colour when used under acidic foods.
>
> RR
>
>>Please, glaze gurus everywhere, have you tested this recipe (I got from a
>>friend and saw that the archives has many recipes with this name), and
>>is it food safe at cone 6-7 oxidation? Would it still be food safe if I
>>increase the Iron Oxide to 5 % and Cobalt to 1 % to get a mat coffee
>>brown?
>>
>>Tea Dust
>>Potash feldspar 50
>>Kaolin 15
>>Silica 5
>>Whiting 15
>>Red iron oxide 0.5
>>Manganese dioxide 0.5
>>Cobalt carbonate 0.5
>>
>>Na2O 0.07 Al2O3 0.42 SiO2 2.33
>> K2O 0.17 P2O5 0.00
>> MgO 0.00 TiO2 0.00
>> CaO 0.46 Fe2O3 0.10
>> MnO 0.17
>> CoO 0.13
>>
>>Alumina:Silica ratio is 1.00:5.50
>>Neutral:Acid ratio is 1.00:5.73
>>Alk:Neut:Acid ratio is 1.00:0.42:2.43
>>
>>Expansion: 85.3 x 10e-7 per degree C
>>
>>Thank you so much for any input!!!
>>Heloisa Nunes
>>Sao Paulo, SP
>>Brazil
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
> Phone: 613-475-9544
> Fax: 613-475-3513
>
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