[Clayart] white glaze (^6, Ox)
edouardb at colba.net
Sat Apr 7 16:38:47 EDT 2018
There is nothing toxic in this base
My Books :
----- Original Message -----
From: <ronroy at ca.inter.net>
To: "Clayart international pottery discussion forum"
<clayart at lists.clayartworld.com>; "Madeleine Hall-Arber" <arber at mit.edu>
Cc: <clayart at lists.clayartworld.com>
Sent: Saturday, April 07, 2018 1:23 PM
Subject: Re: [Clayart] white glaze (^6, Ox)
> Hi Madeleine,
> There was not much difference when you subbed in Min spar for the F4 -
> certainly not enough to make it matte. Did those kiln loads cool slower
> than usual?
> This glaze is not stable by the way - short of both alumina and silica. I
> would not recommend it as a liner glaze.
> You should mix up a mall batch to see if you made a mistake.
> This one is a bit closer to the original.
> 19.50 DOLOMITE
> 13.00 GERSTLEY BORATE (Laguna June 2011)
> 26.00 SILICA
> 41.00 FELDSPAR MINSPAR 200 (soda)
> 13.00 ZINC Oxide
> Total = 112.5
> 0.33* CaO
> 0.22* MgO
> 0.04* K2O
> 0.10* Na2O
> 0.31* ZnO
> 0.00 Fe2O3
> 0.00 TiO2
> 0.10 B2O3
> 0.15 Al2O3
> 1.85 SiO2
> Si:Al: 12.12
> SiB:Al: 12.76
> Thermal Expansion: 484.50
> Formula Weight: 196.24
> Quoting Madeleine Hall-Arber <arber at mit.edu>:
>> I have used a glossy white glaze that runs a bit when thick, but has a
>> beautiful effect when dripped a bit over (or under) other glazes.
>> Suddenly, it came out with a matt finish. The first time, I thought
>> maybe I hadn't quite reached ^6, but the second firing was clearly ^6.
>> It is possible, of course, that I made a mistake in mixing, but was
>> wondering if anyone knows if the switch from Kona F4 to Minspar could be
>> responsible? (I think that is the only change in chemicals since the
>> last time I mixed this glaze with the possible exception of a new bag of
>> White, glossy, ^6
>> Dolomite 19.5
>> Gerstley Borate 13
>> Silica 28.6
>> Feldspar Kona F4 (sub minispar) 39
>> Zinc Oxide 13
>> P.s. I think I found the "Purple Bright" I asked about a few days ago
>> listed as "Bright Purple" in Britt's book!
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> Ron Roy
> ronroy at ca.inter.net
> Web page ronroy.net
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