Lori Leary on sat 19 apr 97
In teaching raku classes, I have sometimes found it a headache to juggle
glazes with various maturing temperatures. After reading Mel Jacobson's
article on volcanic ash glazes in the November/December Claytimes, I had
an idea.....What would happen if I altered the proportions of Volcanic
Ash and Gerstley to create a base raku glaze? For those that have not
read the article, Mel discusses using a 60/40 Volcanic Ash/Gerstley mix
and firing from a range of ^1 to ^6.
For raku, I changed the proportions to 20/80 Volcanic Ash/Gerstley.
Using this base glaze over Highwater's Phoenix resulted in pots with the
best crackle I have ever seen in a raku glaze. The surface ranged from
satin to glossy, depending on how high I fired. I then tried various
oxides and stains. For example, with 2% copper carbonate, I have gotten
lovely blue/green crackle, copper lusters, and copper reds, depending on
how I handled the post-firing reduction.
My students enjoy mixing their own recipes, I no longer have to worry
about glazes with different maturing temperatures, and it is easy to
fill out my purchase orders. And best of all....we make good pots.
Lori Leary
lleary@sccoast.net
Pawleys Island, SC USA
Dannon Rhudy wrote:
>
> -------------Original message----------------------------
> Jeff
>
> There is an article in Claytimes dealing with some of the uses
> of volcanic ash as a glaze ingredient. It was two issues ago,
> I think, or perhaps three.
>
> Mel Jacobson wrote the article.
>
> Dannon Rhudy
> potter@koyote.com
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