Comment

Comment by Anthony Andersen on March 23, 2011 at 11:41pm

For ^6-6.5 firings, I used Mile Hi Aspen. Mile Hi is my local shop. Here's the blurb from their web site:

Aspen (Cone 5-7) This fine, translucent porcelain was developed as an alternative to Cone 10 firing. Aspen responds well to hand modeling or wheelwork.

http://www.milehiceramics.com/clay.htm

My only issue with that clay is you have to trim the bottom or really be careful with compression because it's much more likely to crack than any other clay I work with (including other porcelains) if the bottom is fairly thin. That being said, I've had really good results with that clay from ^5 to ^6.5 in oxidation and reduction and it's really nice to throw.

 

I expect that "The Coup" from Matt and Dave's Clays would also be good at that range. It's ^5-8. I've had good luck with their ^8-12 "Porcelain for the People" at ^8 oxidation and ^10 reduction and I plan to try "The Coup" soon.

http://www.mattanddavesclays.com/store/

Comment by Mary Jane on March 23, 2011 at 9:45pm

Thanks so much for the information.  Also, I learned from your post that Mile Hi sells clay that is 5-7 firing range.  Very good to know.  My clay says cone 5 but will go to 6 - but I hear it bloats if you go any higher than that.  5-7 would be perfect.

 

What porcelain did you use?  What is the firing range of the porcelain?  I found that the glazes from the SH workshop did look and perform (i.e. no blisters, etc) better on porcelain.  Thanks again for the info.  Cheers, MJ

Comment by Anthony Andersen on March 23, 2011 at 9:29pm

In case I wasn't clear - I used the exact recipe from the Lakeside Pottery website as the SCM base.

Comment by Anthony Andersen on March 23, 2011 at 9:27pm

There was actually a little iron in the SCM. I had a little SCMO, also with 1% SiC, so I mixed it in with the SCM. It was probably between 10% and 15% of the total. Put another way, you'd add 1/10 to 1/7 of the amount of Yellow Iron to SCM as you'd normally add for SCMO.

The Water Color Green, Jenn's Juicy Fruit, and Hanna's Fake Ash were unchanged.

 

I did have a little bit of pinholing on the stoneware so I think that may have done better a little hotter. The porcelain didn't have any problems.

 

My blog shows what the glaze looked like before firing in case you're interested...

http://anthonyandersen.blogspot.com/2011/03/sprayed-cone-6-12-scmsi...

 

Firing Schedule:

200/hr to 200

400/hr to 1900

200/hr to 2160 - hold for 1 hour

-500/hr to 1900

-125/hr to 1400

 

Here's the Orton Cones - 5, 6, 7, clockwise from bottom.

Comment by Mary Jane on March 23, 2011 at 8:44pm

Ah - forget to ask about the firing schedule.  Thanks, MJ

Comment by Mary Jane on March 23, 2011 at 8:41pm

Hello - Really like the cups.  Did you modify the recipe for strontium crystal magic other than the 1 percent silicon carbide?  The recipe i have is for cone 8 with an unusual firing schedule.  You mention that you fired this to cone 6.  Same question for Jenn's Juicy Fruit and Water Color Green and Hanna's Fake Ash.  The recipes i am using is from the Stephen Hill workshop and also shown on the lakeside Pottery website.  Any help on this is appreciated.  Great cups.  Cheers, MJ