I am not certain of the origin of this glaze but I got it from the Prince Albert Arts Center and I believe they got it from the Saskatoon Potter's Guild.


Custer Feldspar 22

Gerstley Borate 22

Neph Syen 22

Silica 26

Wollastonite  3

EPK  3

Titanium Diox  2


Red Iron Oxide  3

Copper Carb  4

Bentonite  2


I sprayed the glaze, applying continuously and working around the piece until the glaze started to run.  This gave me a somewhat thick coat which fired to a nice glossy brown with very funky green spots.

Views: 7303

Reply to This

Replies to This Discussion


    What did you bisque at after the glaze fire? 06?


Usually it is a fast ^06.  If I have something in with a real bisque, then it goes to ^04 on a slow bisque.  It is the time spent up around 900c that allows the RIO to crystallize into the red that you see.  I normally do a 45-60 min hold @ 962c on the way down & that helps, but putting it back in the bisque draws out even more red.  jhp

I second Jeff's comment on throwing it in with a bisque firing , strange but true. The red or iron crystals form at that temp, below that you get green and brown and at higher temps you get black. I have taken ugly greenish brown bowls and included them with a bisque and gotten same ugly bowls but red, ok my bowls have improved but Jeff's vases still trump anything I throw

This is Frogskin on porcelain fired to ^6 with a very slow-cool from 1,800 F to 1,500 F at 50 F per hour.

I've usually found iron containing glazes lose a lot of iron to clay-binding on white clays. Applied on iron-rich clays, the glazes lose none of their iron resulting in a much different coloration.

I just applied "Clear Base Blue" on iron-rich Amador clay and pulled out some pieces which were golden brown without a hint of blue or green.  On this white clay tile the golden brown is clearly visible only on the breaks in surface texture.

6.0%  Rutile

3.0% Red Iron Oxide

1.0% Cobalt Carbonate

0.8% Copper Carbonate

Reply to Discussion



  • 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