"C6IRED" Firing Schedule

Cone 6 Iron Reds

This holds the kiln at 1760F. While the firing schedule at https://glazy.org/recipes/111576 also holds an hour at 1600F and 1500F this focus on a single temperature is likely better. To improve crystal development try holding at 10, 20, 30, 40 and 50 degrees hotter and colder to find the best temperature. Then try holding for longer and shorter periods at that temperature.

We have also found that the C6DHSC slow cool schedule (100F/hr from 2100 down to 1400) grows the iron crystals well. This is very convenient since that schedule is used often in our studio.

Step	°C	°F	Hold	Time
1	138°C/hr to 121C	250°F/hr to 250F	60min	1:42	Evaporate all mechanical water
2	194°C/hr to 1148C	350°F/hr to 2100F	0	6:59
3	60°C/hr to 1204C	108°F/hr to 2200F	10min	8:04	Slow down to even out kiln chamber
4	555°C/hr to 1148C	999°F/hr to 2100F	30min	8:40	Heal blisters, pinholes here
5	555°C/hr to 960C	999°F/hr to 1760F	50min	9:51	Grow iron crystals here

Start temperature assumed: 25°C or 75°F
"Fahrenheit degrees" is not the same as "degrees Fahrenheit". A 100° reading on a Fahrenheit thermometer is equal to a 37° reading on a Celcius thermometer. But "100 Fahrenheit degrees of temperature change" is equivalent "55 Celsius degrees of change". That is an important distinction to understand the above temperature conversions.

By Tony Hansen
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