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bciskepottery

Member Since 28 Jun 2010
Offline Last Active Today, 08:34 AM
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Posts I've Made

In Topic: Commercial Glaze To Acheive Crackle Effect With Bisque To Cone 6 And Fireing...

Yesterday, 06:58 PM

sorry, its bisque to cone 06. this is the glaze i'm looking at:
Duncan Crystals & Crackles Glazes Celadon Crackle
but it needs an 04 bisque... does anyone know of a glaze that would work with a 06 bisque?


I bisque to cone 05. Some porcelain users will bisque much lower. The main difference is how absorbent the bisque will be when glazing. Many studios bisque at cone 05 or 04 to help reduce glaze runs by less experience students. A higher bisque temperature also helps burn out more clay impurities that could affect the look of a glaze. You may have to experiment with glaze thickness since your bisque is lower and the bisqueware a bit more absorbent. Go ahead and use the Duncan. Make up a handful of test tiles and go for it.

In Topic: Darted Cups

Yesterday, 06:44 PM

Where are you making your darts -- bottom of the cup, top, or middle? Could you add a picture?

When I am making round items (cups, vases) from slabs, I will take my slab, put it on a flat foam cushion, and roll it with a rolling pin to give it a curl. That gives the slab a curled/curved memory to revert to as it dries, rather than a flat memory. The clay in a slab cup tends to be more moist at the seam -- where you add slip, magic water, or spit to join the pieces; the join also tends to be thicker due to the overlap. So, it is important to dry slowly and let the moisture level even out. I prefer a long, tapered join on the seam to a short one.

I use both paper and Styrofoam cups to help keep the rim round while slowly drying. I cut out the bottom of the cup so that the walls give a bit to compensate for clay shrinkage when drying.

In Topic: Buying New Kiln, L&l Or Skutt

23 August 2016 - 08:40 PM

Mike -- it is always helpful to have insights from the manufacturer's of the equipment we use in our studios and to have manufacturer's who care enough to read the forum postings and contribute to the discussions.  And you are joining a very helpful group of kiln experts -- Arnold Howard from Paragon and Neil to name a couple -- who share their knowledge and experiences with members and their questions.  We also have members who work for Sheffield and other distributors.  Being in the business, you know you will find potters with strong convictions based on their experiences -- whether preferences for kilns, how to center, or . . . one of our most interesting and continuing discourses, the use of Griffin Grips.  Hope you feel comfortable enough to stay around the forum. 


In Topic: Red Stoneware Clay For An Aged Look?

21 August 2016 - 06:43 PM

From his website --

 

"I also enjoy the process of making forms with coils and over the last 5 or 6 years have been making some medium sized vessels that are inspired largely by African pottery and to a lesser extent Neolithic Chinese pots. Many of these are stained with iron oxide and coated with a clay and wood ash slip."

 

He uses stoneware and fires a gas kiln in reduction.  http://www.rickhintzepottery.com/

 

An iron oxide wash can be made with red iron oxide, either gerstley borate or a ferro frit, and water.  The gerstley borate/frit help the red iron oxide melt so it does not rub off.  Many apply the red iron oxide wash during leather hard stage; others wait until bisque.  Either way can work; it depends on your style and the effect you are trying to achieve. 


In Topic: Native Clay, Odd Smell...

17 August 2016 - 06:55 PM

Make a test tile and fire it (put it in a known clay container or dish in case it melts).  See if the smell goes away after firing.

 

Also, allow some of the clay to dry, then crush it into powder and reconstitute to see if that makes a difference. 

 

Agree with Marcia -- you can take the clay out of the pond, but you can't take the pond out of the clay.  Could be the residual of an organic release under the pond that is slowly seeping up  through the clay -- including an ancient forest fire or other event.