Non food grade glazes

Shoshin

Sapling
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27
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Location
Strafford, NH
USDA Zone
5
Is there any info out there regarding glazes for pots and if non food grade is ok for bonsai?
 
Some glazes that are considered unsafe for food are for reasons that go beyond chemical content, mostly "speciality" glazes that may not be frost proof, or otherwise durable enough for bonsai use.

Sorce
 
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