"FSCRGL" Firing Schedule

GC106 Base for Crystalline Glazes

This base can give extremely brilliant colors; I’ve had particular success with red copper oxide. I’ve also noticed that cobalt is far less likely to felt up when used with this glaze, even when a large amount of colorant is used. Mixtures incorporating ilmenite and/or rutile work very well with this recipe, giving very large, quickly growing crystals. The crystals do not show the variation in shape one sees with the Ferro 3110 based glazes.

Step	°C	°F	Hold	Time
1	100°C/hr to 200C	180°F/hr to 392F	0	2:02
2	250°C/hr to 500C	450°F/hr to 932F	0	3:14
3	500°C/hr to 1275C	900°F/hr to 2327F	0	4:47
4	9999°C/hr to 1130C	17998°F/hr to 2066F	15min	5:03
5	30°C/hr to 1075C	54°F/hr to 1967F	0	6:53

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

My 106 based “Shimbo Green”

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With a little iridescence from post-fire raku. The green is a true emerald green and very brilliant. Crystals do form very fast, however, and I have seen them attain an entire centimeter in diameter in as little as fifteen minutes

Links

Recipes	GC106 - GC106 Base Crystalline Glaze Cone 8-10 - Most other GC106 recipes are based on this.
Typecodes	Oxidation Firing

By Tony Hansen
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