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.
|1||100°C/hr to 250C||180°F/hr to 482F||2:32|
|2||250°C/hr to 500C||450°F/hr to 932F||3:32|
|3||500°C/hr to 1260C||900°F/hr to 2300F||5:03|
|4||999°C/hr to 1075C||1798°F/hr to 1967F||90min||6:44|
|5||999°C/hr to 1100C||1798°F/hr to 2012F||15min||7:01|
|6||999°C/hr to 1075C||1798°F/hr to 1967F||7:02|
|10||999°C/hr to 1050C||1798°F/hr to 1922F||15min||7:19|
|10||999°C/hr to 1075C||1798°F/hr to 1967F||7:20|
Shimbo Crystal Holding Pattern 1
Electric firing: Crystal Glazes 2 by Fara Shimbo (page 137)
Shimbo Crystal Holding Pattern 3
Electric firing: Crystal Glazes 2 by Fara Shimbo (page 139)