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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
C6IRED - Cone 6 Iron Reds
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

PLC6DS - Cone 6 Drop-and-Soak Firing Schedule
QICA - Quartz Inversion Cracking Avoider

"PLC6CR" Firing Schedule

Cone 6 Crystal Glaze Plainsman

With the advent of computer controlled kilns, producing crystal glazes at medium and high temperatures is quite easy, just use a really fluid zinc glaze and fire a schedule that gives them opportunity to grow.

Adjust the final temperature on step 3 to match the temperature your kiln reads when it reaches cone 6.

Note that almost everyone who uses crystalline glazes either does not notice or has accepted the crazing that these naturally produce on typical porcelain clay bodies at middle at high temperatures. This is not necessary, a high expansion clay body can be employed to prevent this.

Step °C °F Hold Time
1 176°C/hr to 372C  316°F/hr to 701F    2:08  
2 398°C/hr to 1093C  716°F/hr to 1999F    3:57  
3 65°C/hr to 1210C  117°F/hr to 2210F    5:45  
4 398°C/hr to 1093C  716°F/hr to 1999F    6:03  
5 398°C/hr to 1037C  716°F/hr to 1898F    6:11  
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.

Related Information


Recipes G2902B - Cone 6 Crystal Glaze
Glossary Crystalline glazes
A type of ceramic glaze made by potters. Giant multicolored crystals grown on a super gloss low alumina glaze by controlling multiple holds and soaks during cooling
By Tony Hansen
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