Shimbo Crystal Holding Pattern 2

Electric firing: Crystal Glazes 2 by Fara Shimbo (page 138)

Start temperature assumed: 25°C
Step Rate to Temp °C Rate
°F/hr
To °F Hold Accum
Time
1 100°C/hr to 250 180 482   2:32  
2 250°C/hr to 500 450 932   3:32  
3 500°C/hr to 1260 900 2300   5:03  
4 999°C/hr to 1075 1798 1967 90min 6:44  
5 999°C/hr to 1100 1798 2012 15min 7:01  
6 999°C/hr to 1075 1798 1967   7:02  
10 999°C/hr to 1050 1798 1922 15min 7:19  
10 999°C/hr to 1075 1798 1967   7:20  
*Rates are expressed as "Celcius/Fahrenheit degrees", temperatures as "Degrees celcius/fahrenheit"

These manganese-colored Bory 1 crystals were grown on White Stallion porcelain.

By choosing carefully the point at which you hold (or don't hold)
your temperature, you can change the shape of the crystals you grow. At the high end, crystals tend to be acicular (needle-like). As the temperature is lowered through the growing range (something often referred to as a 'slant soak' the crystals 'fan out' and produce more variety of shape (as in Illustration 7.4). You can, if you like, hold your temperature at one point and get a crystal whose internal structure is very uniform, or allow the temperature to change and produce a more flower-like effect. Note also that the crystal color lightens as the temperature is lowered.

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