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Firing Temperature Chart

10/9/2014

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I just found the most helpful chart for seeing at a glance how the different "cones" relate to each other (Cone 022 to Cone 10) and what their firing temperatures are (approximately). There are also notes on the side that may be helpful but can also be misleading, so use them critically. For instance, the chart points to Cone 10 and says that "Oxidation takes place in the Electric Kiln" and "Reduction takes place in the Gas Kiln." I think I know what they're trying to say, but the novice might think that reduction is only taking place once Cone 10 is reached which is not correct. Reduction is a long process that usually begins much earlier than Cone 10, especially if you're firing copper reds. The chart also suggests that bisque temperatures for pieces that will be used in sawdust firings should be in the 018 to 016 range. I bisque my pots for pit firing to 018, but I know many potters who bisque their pots for these firings at much higher temperatures, hundreds of degrees hotter, around cone 010. But with these caveats in mind, the chart is still useful. Here's the link: http://www.bellevuecollege.edu/artshum/materials/art/Husby/FiringTemperatures.pdf.
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    I hope this blog will be encouraging to potters, especially beginning potters, and a source of helpful information and comment.

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