Ivor on sun 6 mar 05
There was a thread on Aventurine glazes recently. I just came
across this definition.
These are transparent glazes which have crystals or spangles
suspended in their glassy matrix. The crystals reflect light,
resulting in a sparkling appearance - rather similar to the flitters
(sic) of haematite (iron oxide) found in aventurine quartz, from
which the glaze name is taken. Although aventurine glazes
produced by crystals of iron oxide are by far the most common,
such glazes have also been produced with chromium, copper and
uranium.
The author states that by far the best aventurines are produced in
lead glazes - ....he goes on to discuss lead glaze with ca. 11%
iron oxide and low alumina. Slow cooling is required.
Elsewhere he mentions addition of ilmenite to the above mix to
produce aventurine glazes.
Harry Frazer; Glazes for the Craft Potter; Pitman 1973; Watson
Guptill NY 1974.
Hope this is of some use!
Ivor
Ivor J Townshend
Macclesfield UK
John Britt on sun 6 mar 05
I have recipes and samples in my book of cone 10 aventurine (no lead). And
as Terry Hatcher said on Seinfeld - " They are real and they're
spectuclar".
Every time I see them I am amazed,
Hope you try them sometime,
John Britt
www.johnbrittpottery.com
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