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03DSFF - Cone 03 Fast Fire
04DSDH - Low Temperature Drop-and-Hold
BQ1000 - Plainsman Electric Bisque Firing Schedule
BRTF05 - Bartlett Fast Glaze Cone 05
BRTF6 - Bartlett Fast Glaze Cone 6
BRTS6 - Bartlett Slow Glaze Cone 6
BTFB04 - Bartlett Fast Bisque Cone 04
BTSB04 - Bartlett Slow Bisque Cone 04
BTSG05 - Bartlett Slow Glaze Cone 05
C04PLTP - Plainsman Low Temperature Drop-and-hold
C10RPL - Plainsman Cone 10R Firing
C5DHSC - Plainsman Cone 5 Drop-and-Hold Slow-Cool
C6DHSC - Plainsman Cone 6 Slow Cool

C6MSGL1 - Mastering Glazes Cone 6
C6PLST - Plainsman Cone 6 Electric Standard
FSCG1 - Shimbo Crystal Schedule 1
FSCGB1 - Shimbo Crystal Holding Pattern 2
FSCGCL - Shimbo Crystal Celestite Schedule
FSCGWM - Wollast-O-Matte Fara Shimbo Crystalline Glaze
FSCRGL - GC106 Base for Crystalline Glazes
FSHP1 - Shimbo Crystal Holding Pattern 1
FSHP3 - Shimbo Crystal Holding Pattern 3
FSNM5 - Fa's Number Five
MDDCL - Medalta Decal Firing
PLC6CR - Cone 6 Crystal Glaze Plainsman
PLC6DS - Cone 6 Drop-and-Soak Firing Schedule
QICA - Quartz Inversion Cracking Avoider

"C6IRED" Firing Schedule

Cone 6 Iron Reds

This holds the kiln at 1760F. While the firing schedule at 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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