Soda Fired Commercial Clays

So I wanted to see what all of my locally available commercial clay looked like in our Soda Kiln. I took 12 commercially available clay bodies tested in this base recipe to get an idea which were more likely to flash:

10 Nepheline Syenite, 10 200m Silica, 80 Clay

For good measure I threw in a few Shino glazes, and tried calcined EPK for the hell of it (I actually wanted to see if it deflocculated like the rest of them.. it didn’t really…)

From the 100g test batches, I then tested each slip/shino on Laguna 550 Porcelain, B-Mix, and Miller 510 Stoneware in 2 firings that were unfortunately pretty similar in atmosphere and soda introduction. First firing on top, 2nd on bottom. Tiles were scattered throughout the kiln, so some got blasted, others not so much.  Standard body reduction and reduction firing to cone 9/10, heavy reduction during soda intro, and reduction cooling from 2300-1800F. I scanned the sides that were more interesting, or showed more variation. Hope this helps you narrow down what you might be looking for with soda fired clay slips!

Author: mattfiske

My name is Matt and I'm a potter living in Southeast Alaska. I've been an artist/teacher/potter for the past decade, and I got my start in ceramics in high school some 18 years ago. These days I make my living selling wheel thrown pottery that sits at the intersection of ceramics/science/mineralogy/and geology.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s