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Go to CopperRed Page -> Article on Oxblood Glazes with Pictures

I use glass fruit bottles and some glaze
materials to make a beautifully flawed 
glass pool that crazes and makes an 
unusual pattern in the bottom of the bowl.
The anhydrous silicate glass has poor 
expansion and contraction qualities. 
It crazes at about 1500 degrees F. That 
is just as the glass solidifies. The glass 
is usually a liquid. In this state, the glass 
is a solid and the silica conglomerate cracks
along the lines of ion crystallization. 
The glass is still soft and continues to
contract at a rate equal to the clay and
glazes around it. The result is a pool of 
glass that is cracked. The light reflects 
off the lines of crazing to produce these 
patterns. This is the quintessential 
example of what the potter must do to 
produce a wonderful piece of art. Study 
the flaw and perfect the flaw until it is
beauty. 

I must admit that there is another 
explaination for this phenomenon: 
The brains of Deadheads, frozen melted 
freckles, and fairy dust will also produce
this effect...


 
Russell Andavall
The FireGod

You are the th traveler along this path