The Plastic Vitrox Gerstley Borate combination has been very popular and used for many years
as a base glossy glaze for cone 6 (so we have dedicated a separate page to it). This recipe doubtless originated in California
since PV Clay is mined there and was in common use since the 1970s and perhaps
earlier (i.e. the California Artware casting body contained PV Clay). Since this
recipe is comprised entirely of clay-containing minerals it shrinks and cracks
off ware if it is applied too thick. On the other hand it makes a good slip to
apply to leather hard ware since it will shrink with the clay as it dries. To
learn more about PV Clay click the link below.
To create a white from this most people add 10-20% zirconium silicate.
We do not anticipate a problem using Boraq with this recipe. If you are
mixing your own Boraq you have the option of leaving out the Hectorite to reduce
the drying shrinkage.
INSIGHT 5.3 Comparison Report
|PV Clay:Gerstley Borate Base Cone 6
||PV Clay:Boraq 2 Base Cone 6
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