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FAQ/Answer

Why does the Orton cone chart have three columns?

The three columns in the Orton temperature chart each represent a different firing speed. The 27 degree F column = 27 degrees per hour of temperature rise during the last 90 - 120 minutes.

Digital kilns are programmed with cone temperatures from the 108 degree column.

The 27, 108, and 270 degrees per hour rates apply only to the last 90 - 120 minutes of firing. The earlier part of the firing can be fast or slow, and the temperatures in the columns will still apply.

The Orton chart is similar to B&W film developer charts. Processing time varies depending on developer temperature. The higher the temperature, the shorter the film processing time.



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