If you want to convert cone 10 glaze recipes to cone 6, you’ll need to know something about glaze chemistry and the materials that work best at those different temperatures. If you just want to start with established cone 6 recipes, which is often a lot easier, there are now many people who have done the research and testing so you don’t have to. But don’t worry; there will still be plenty of glaze-testing fun for you to try in your own studio.
In Making the Switch from Cone 10 to Cone 6 Ceramic Glaze Recipes: A Little Knowledge of Ceramic Glaze Chemistry and Raw Materials Goes a Long Way, we present several successful examples of cone 10 glazes reformulated to work at mid range, and include explanations of the glaze chemistry behind these successes.
Here’s an excerpt:
by Rick Malmgren
I have become a strong advocate of Cone 6 reduction firing in recent years. My reasons are as follows:
1. Lovely traditional glazes look as good as or better fired at Cone 6 than they do at Cone 10. Copper reds, Shinos, temmokus and dolomite matts are virtually indistinguishable from their Cone 10 brethren. Some Cone 10 glaze recipes don’t even need to be adjusted— a few look just great at Cone 6
2. Fuel savings amount to about 30% over a Cone 10 firing. Granted, that isn’t much per firing (only the cost of two coffee mugs per kiln load, as Pete Pinnell once said), but if you are burning $2000 worth of propane per year, as I was a few years ago, it amounts to a nice $600 bonus at the end of the year
3. The savings in fuel costs is nothing, compared with the savings of time and energy. Being able to fire off a full kiln load in 7½ hours instead of the 10½ that it used to take me is where the real savings comes in. At Cone 6, I can fire during the day and teach at night, on a more normal work schedule.
4. Though I’ve fired my kiln more than 700 times, each firing takes its toll. The hotter it is fired, the harder it is on the arch, the walls and the shelves. There is that much more expansion and that much more contraction, and that much more slumping. Cutting the temperature saves all the way around.
For more recipes, download your free copy of Making the Switch from Cone 10 to Cone 6 Ceramic Glaze Recipes: A Little Knowledge of Ceramic Glaze Chemistry and Raw Materials Goes a Long Way…
Making the Switch from Cone 10 to Cone 6 Ceramic Glaze Recipes: A Little Knowledge of Ceramic Glaze Chemistry and Raw Materials Goes a Long Way also includes the following informative articles:
|Mid-Range Reduction: It’s Not Just Cooler, It’s Cool
by John BrittThere are a number of reasons why someone would want to fire at cone 6 rather than cone 10, but John Britt was not one of those people-until he was asked to present a workshop on the topic. His understanding of ceramic glaze materials and glaze chemistry helped him to quickly find a path from cone 10 firing to cone 6.
|Cone 6 Crystalline Glazes: Developing Crystals at Mid Range
by William SchranHistorically, crystalline glazes have been the purview of the high-fire potter. But like everything else, if enough people experiment and test, good results can be obtained under all sorts of circumstances – in this case, crystals at cone 6.
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