Last year I decided to resume my passion for modeling clay and in particular stoneware and porcelain clay. 

I decided to specialize in single firing (I had a book taken in Scotland several years earlier). 

At the moment I'm cooking at 1240°C, non-stop. The cooking lasts 3 hours between 0 and 200°C and then travels at a speed of about 100°C per hour (if I remember correctly: the oven is not mine).

I'm doing glazes experiment using wood ash. This idea came from the fact that we use the fireplace and in particular the pellet stove for the winter. 

Wood ash from the pellet stove is probably not ideal: because some of the finer particles are lost and the sieve work is longer and give a coarser material. But I have a lot of ash from this stove and it's a shame not to use it, if possible.

I had some book from Scotland about ash glazes and cone 6 glazes and I'm starting from them.

To make my life easier, I use wood ash washed several times but I do not dry it: I let it settle and remove the surface water leaving only about 1 cm of water. 

At the beginning I used a volumetric system in the first 2 recipes (photos).

Recipe 1:

- 1 jar of dense slip of 1250°C spotted stoneware clay

- 1 jar of thick potassium feldspar slip

- 2 jars of dense wood ash slip

Recipe 2:

- 1 jar of dense slip of porcelain clay

- 1 jar of thick potassium feldspar slip

- 2 jars of dense wood ash slip.

Than I made 2 little experiment with a little of cobalt and copper oxide.

I calculated that those slips contain approximately 50% water and 50% clay or feldspar. Instead, I estimate a quantity of about 300 grams of dry ash in a liter of ash slip. The calculation is very approximate but future experiment I am conducting will be based on this hypothesis.

Views: 31

Reply to This

Videos

  • Add Videos
  • View All

Use These Links to Support Us

Low cost flat lapping disc can be used on you potters wheel if you, drill bat pin holes in it, and provide a trickle of water to cool it. At amazon.com, 120 grit for aggressive material removal. Click the image to purchase 

Members have had great things to say about John Britt's new book, Mid-Range Glazes. Click the image to buy from Amazon.com

Purchase Glazes Cone 6 by Michael Bailey, The Potters Book of Glaze Recipes by Emmanuel Cooper, or Making Marks by Robin Hopper, all available at amazon.comMastering Cone 6 Glazes by John Hesselberth & Ron Roy is now out of print.

Harbor Freight is a great place to find unbeatable prices for better HVLP spray guns with stainless steel parts and serviceable economy models, as well as detail guns, all tested by our members for spraying glazes, as well as compressors to power the guns. As yet no one has tested and commented on the remarkably inexpensive air brushes at harbor freight.

The critter siphon gun is a spray alternative that is well liked by some of our members, and is available at amazon.

Amazon is also a competitive source for photo light tents for shooting professional quality pictures of your work. They also have the EZ Cube brand favored by several of our members. You might also want to purchase the book Photographing Arts, Crafts and Collectibles . . .

If you are up to creating videos of your work or techniques you might want to invest in a flip video camera

Following are a few scales useful for potters. Your final price could be less or more - things change.

American Weigh Black Blade Digital Scale, 1000g X 0.1g $11.08 

For the non-digitally inclined the old standard Ohaus Triple Pro Mechanical Triple Beam Balance, 2610g x 0.1g, with Tare $169.00

And finally a low cost clone of the OHaus. The Adam Equipment TBB2610T Triple Beam Mechanical Balance With Tare Beam $99.62

ebay is a great alternative for many tools and the equipment used in the ceramics studio - kilns, wheels, extruders, slab rollers are often listed there both new and used.

Tips for Members

If you just want to spout off, it is best accomplished as a blog posting. If you want to get more guidance and ideas from other members, ask a question as a new discussion topic. In the upper right corner of the lists for both types of posting, you will find an "+Add " button. Clicking it will open an editor where you create your posting. 4/16/2014

© 2021   Created by George Lewter.   Powered by

Badges  |  Report an Issue  |  Terms of Service