Joan Conklin on thu 15 sep 05
Wow! I really like 244 Post...when I get back from Salt Lake City ...I am
going to try this with a range of oxides and stuff....I have been looking
for soft soft white.
In addition I am looking for a black...a true black without a high gloss. I
have used Ron Roy's gloss black with great success but does anyone have a
soft velvet black that works over porcelain (Frosty White) or BMix Laguna -
both cone 6.
By the way....the Frosty by Laguna is transparent at cone 6...and works very
well with Zinc Qxide Crystal Glazes. Regards, Joan in Canada
>From: John Post
>Reply-To: Clayart
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Re: A nice fat cone 6 white
>Date: Wed, 14 Sep 2005 22:58:10 -0400
>
>The whole experiment with Post's 244 was to develop a buttery magnesium
>matte glaze at cone 6.
>Stability and staying within the limits was not the goal.
>
>Rhodes 32 is short of silica, yet mel has been using it for years.
>I have run 2 Currie grids so far using magnesium as the main flux.
>
>It appears to me as though the buttery smooth feel is dependent on not
>only the magnesium, but on the relationship between it and silica and
>alumina. I will add some copper to the Post's 244 and send it in for
>lab testing...just because I am curious about it. I like it just the
>way it is with its smooth fat white feel. I am not worried about it
>leaching anything into food, because there are not any metals in it that
>I am concerned about.
>
>The 3 different variations I tried all worked ok. My favorite studio
>and classroom glaze has 24% clay in it. The high clay content of the
>Post's 244 is not a problem for me. I prefer glazes high in clay.
>Ron's and Bill's variations worked fine. I think the application on
>Bill's variation was a little thin and that may account for the clay
>body showing more through his glaze. I think his idea of adding tin to
>his variation will probably remedy that. Ron's variation was opaque. I
>still think the original has a slightly more buttery surface than either
>variation...but only marginally.
>
>If you want to see the currie grid starting points I have now added
>these to the bottom of my web page.
>http://www.wideopenwest.com/~jpost4400/
>
>Info about the grids.
>
>The 244 grid fluxes are..
>.18 Na2O
>.20 K2O
>.4 CaO
>.4 MgO
>
>The second grid I call Col1-3 and its fluxes are...
>.14 Na2O
>.05 K2O
>.22 CaO
>.6 MgO
>
>.2 B2O3
>
>Cheers,
>John Post
>
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> ow
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