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Gerstley Borate - 1 lb.
 
A source for CaO, Na, Mg. This was mined in southern California for many years. The mine was closed in 2000 and remaining stocks were to be depleted in 2-3 years, however they continued much longer. There was alarm across the ceramic community in North America about the demise of Gerstley Borate because it formed the basis of so many glazes. For the best information on substitutes visit gerstleyborate.com. There is a page on the site dedicated to understanding what Gerstley Borate was chemically, physically and mineralogically. There are a number of materials that have been developed as substitutes, these are outlined at the website also. However the best approach is to use ceramic chemistry on a glaze-by-glaze basis to substitute other materials. Source: Digital Fire.
 
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Price: $1.85
Quantity Pricing
Quantity
Price
1-4
$1.85
5-9
$1.15
10-49
$0.96
50-99
$0.84
100-499
$0.71
500+
$0.68

 
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