Check out the new Coyote glazes.  3 macros, an Aventurine & an Iron Red.  All slow-cooled......jhp

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Comment by Nadine Mercader on June 10, 2014 at 5:52am
They are great Jeff!
Comment by Norm Stuart on June 9, 2014 at 10:13pm

Jeff - It's nice that commercial glaze makers have begun to sell macro-crystalline and slow-cool products.

I proves macro-crystalline glazes don't inherently have to run all over the place.  The blue is nice.

Comment by Jeff Poulter on June 9, 2014 at 5:03pm

So here are the 3 macros.  They are very well behaved.  My Skutt errored out and I Had to respray them with more glaze & fire them in my L&L. They wouldn't have run at all had I just fired them in my L&L first.  I did not cool all the way to 1400F as suggested, but stopped at 1700F, then ramped back up to 1850, held, & then went 50F/hr down to 1650, held & then off.  I like the Lagoon on the best.....  jhp

Comment by Jeff Poulter on May 25, 2014 at 6:17am

Hi Nadine,

     As soon as they get here & I have a chance to try them out, I will let you know.  I'm with Norm on this.  It can be done.  My friend has done it & there are several several others out there that have done it.  Now Coyote.  It's all in the formulation.  I've been chasing it for a long time.   jhp

Comment by Norm Stuart on May 24, 2014 at 11:21am

Macro-crystalline glazes require a large amount of zinc and silica to form zinc silicate crystals, and thus a fairly high ratio of silica to alumina.

But in my experience this doesn't mean macro-crystalline glazes have to be formulated in a way they're so fluid they require glaze catchers.  I think those are merely the most commonly used formulations.

I too would like to hear users feedback as to the flow rates of these slow-cool Coyote glazes, but the glaze and the firing could easily be formulated to minimize flow. 

Most published macro-crystalline firing techniques call have the kiln linger far longer at higher temperatures, often with repeated cycles - leading to large quantities of glaze flow.

Coyote is calling for a relatively fast slow-cool of 125 F per hour between 2,150 and 1,400 F - a wider temperature range of slow-cooling than the 1,800 to 1,500 F range we use at 50 F per hour. 

Crystal Lagoon

http://coyoteclay.com/blue%20crystal%20closeup.jpg

Mars Red Iron

http://coyoteclay.com/marsredirondetail2.jpg

Ivory Crystal

http://coyoteclay.com/white%20crystal%20detail.jpg

Crystal Celadon

http://coyoteclay.com/green%20crystal%20detail.jpg

Autumn Spice

http://coyoteclay.com/rust%20color%20detail.jpg

Comment by Nadine Mercader on May 24, 2014 at 10:23am
Jeff, Does your firing these agree with their statements that you don't need anything special to catch runoff? If that is true it would influence my desire to try them out.
Comment by Jeff Poulter on May 23, 2014 at 1:28pm

The hyperlink is below.....

Comment by Jeff Poulter on May 23, 2014 at 1:27pm
Comment by Jeff Poulter on May 23, 2014 at 1:25pm

coyoteclay.com

Heres one, I can't get the rest to work   jhp

Comment by Norm Stuart on May 23, 2014 at 12:35pm

Jeff - photos or links?

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