Donna Kat on thu 13 sep 07
I'm trying to make up a nutmeg glaze without dolomite. This is what I
have come up with so far - Can I get some feed back on this please (like
isn't that a huge amount of Talc?)
nutmeg revised by Ron Roy
Feldspar - G - 200 ,23.3,
Frit - Ferro 3134 ,6.8,
Ball Clay - Old Mine #4 ,27.8,
Silica ,17.8,
Dolomite ,23.3,
Red Iron Oxide - Special ,1.07,
Yellow Ochre ,3.24,
Tin Oxide ,4.85,
Bentonite ,1.94,
vs
nutmeg - no dolomite (what can I say - I don't have a big enough order get
it yet)
Ball Clay - Old Mine #4 31.26
Feldspar - G - 200 25.62
Talc 17.29
Wollastonite 15.75
Frit - Ferro 3134 7.82
Tin Oxide 4.85
Yellow Ochre 3.24
Silica 2.26
Bentonite 1.94
Iron Oxide - Red 1.07
Donna Kat on thu 13 sep 07
ARRGGGG!!!! Recipe screw up - that is NOT Ron Roy's Recipe (and this is
why it is dangerous to just use any recipe you find without testing!!!).
The point is can you actually replace Dolomite with Wollastonite and Talc,
cut the silica and get a close match?
/////////////////////////////////////////////////////////
I believe this is
Ron Roy's revised Nutmeg
Dolomite ,22.5
Ball Clay - Old Mine #4 ,22.5
Feldspar - G - 200 ,19.5
Silica ,18.5
Spodumene ,10
Frit - Ferro 3134 ,7
Red Iron Oxide - Special ,1.07
Yellow Ochre ,3.24
Tin Oxide ,4.85
And this is my pass on replacing Dolomite
Talc ,15.80,
Ball Clay - Old Mine #4 ,22.50,
Feldspar - G - 200 ,19.50,
Silica ,5.30,
Spodumene - Foote ,10.00,
Frit - Ferro 3134 ,7.00,
Red Iron Oxide - Special ,1.07,
Yellow Ochre ,3.24,
Tin Oxide ,4.85,
Wollastonite ,15.00,
>I'm trying to make up a nutmeg glaze without dolomite. This is what I
>have come up with so far - Can I get some feed back on this please (like
>isn't that a huge amount of Talc?)
>
>nutmeg revised by Ron Roy
>
>Feldspar - G - 200 ,23.3,
>Frit - Ferro 3134 ,6.8,
>Ball Clay - Old Mine #4 ,27.8,
>Silica ,17.8,
>Dolomite ,23.3,
>Red Iron Oxide - Special ,1.07,
>Yellow Ochre ,3.24,
>Tin Oxide ,4.85,
>Bentonite ,1.94,
>
>vs
>
>nutmeg - no dolomite (what can I say - I don't have a big enough order get
>it yet)
>
>Ball Clay - Old Mine #4 31.26
>Feldspar - G - 200 25.62
>Talc 17.29
>Wollastonite 15.75
>Frit - Ferro 3134 7.82
>Tin Oxide 4.85
>Yellow Ochre 3.24
>Silica 2.26
>Bentonite 1.94
>Iron Oxide - Red 1.07
>
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Ron Roy on tue 18 sep 07
Hi Donna,
Very good - you are now qualified to teach glaze calculation.
Yours has a little more alumina (.35 for the original - yours has .36) but
everything else is excellent. The diff is probably due to a different
analysis of OM #4 - it is quite a variable clay.
Ratio is very close and expansion is right on.
RR
>I'm trying to make up a nutmeg glaze without dolomite. This is what I
>have come up with so far - Can I get some feed back on this please (like
>isn't that a huge amount of Talc?)
>
>nutmeg revised by Ron Roy
>
>Feldspar - G - 200 ,23.3,
>Frit - Ferro 3134 ,6.8,
>Ball Clay - Old Mine #4 ,27.8,
>Silica ,17.8,
>Dolomite ,23.3,
>Red Iron Oxide - Special ,1.07,
>Yellow Ochre ,3.24,
>Tin Oxide ,4.85,
>Bentonite ,1.94,
>
>vs
>
>nutmeg - no dolomite (what can I say - I don't have a big enough order get
>it yet)
>
>Ball Clay - Old Mine #4 31.26
>Feldspar - G - 200 25.62
>Talc 17.29
>Wollastonite 15.75
>Frit - Ferro 3134 7.82
>Tin Oxide 4.85
>Yellow Ochre 3.24
>Silica 2.26
>Bentonite 1.94
>Iron Oxide - Red 1.07
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Ron Roy on tue 18 sep 07
Hi Donna,
Your revision does not add to 100 by the way - not including the iron,
ochre and tin.
This one is not as good as the first one - Calcuim is up and Lithium and
Potassium are down a bit - more important the Boron is down a bit - that
may cause the glaze to be underfired a bit.
Still pretty good though. Probably due to the diffences in our material tables.
Let me know if you have any questions - RR
>ARRGGGG!!!! Recipe screw up - that is NOT Ron Roy's Recipe (and this is
>why it is dangerous to just use any recipe you find without testing!!!).
>
>The point is can you actually replace Dolomite with Wollastonite and Talc,
>cut the silica and get a close match?
>/////////////////////////////////////////////////////////
>I believe this is
>
>Ron Roy's revised Nutmeg
>
>Dolomite ,22.5
>Ball Clay - Old Mine #4 ,22.5
>Feldspar - G - 200 ,19.5
>Silica ,18.5
>Spodumene ,10
>Frit - Ferro 3134 ,7
>
>Red Iron Oxide - Special ,1.07
>Yellow Ochre ,3.24
>Tin Oxide ,4.85
>
>And this is my pass on replacing Dolomite
>
>Talc ,15.80,
>Ball Clay - Old Mine #4 ,22.50,
>Feldspar - G - 200 ,19.50,
>Silica ,5.30,
>Spodumene - Foote ,10.00,
>Frit - Ferro 3134 ,7.00,
>Red Iron Oxide - Special ,1.07,
>Yellow Ochre ,3.24,
>Tin Oxide ,4.85,
>Wollastonite ,15.00,
>>I'm trying to make up a nutmeg glaze without dolomite. This is what I
>>have come up with so far - Can I get some feed back on this please (like
>>isn't that a huge amount of Talc?)
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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