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david baumee's question re: cone 10

updated sun 15 may 05


Ron Roy on sat 14 may 05

Hi Wes,

It is true - that is part of what John found when testing the glazes in our
book - I would say a distinct advantage.

We used rutile but it is the titanium that is the effective part.

There are many glazes that you cannot use it in however.

One of the most durable glazes in our book is the licorice for instance -
no titanium - well maybe a trace from the clay.

Point is you can have very durable glazes without it but - other factors
considered - it can improve durability.


>> I wouild guess - at this stage that keeping the silica between 4 and 5 and
>> the alumina .35 and .5 should do the trick - the glaze must be properly
>> melted though - putting in an opacifier may reverse the stability.
>What about titanium? Digital fire says that:
>-Titania is a complex material because it opacifies, variegates, and
>crystallizes glazes. It also modifies existing colors from metals like
>Cr, Mn, Fe, Co, Ni, Cu.
>Tony als say that it can "stabilize the fired glaze against leaching."
>I hope that your test give some close attention to TiO2 and Rutile at
>Cone 10. I would be interested in the results.

Ron Roy
15084 Little Lake Road
Brighton, Ontario
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513