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The manufacturer warns that these cone 6 metallic glazes are not food-safe. That being said, many potters use them on food surfaces anyway. This can be deliberate or just because the warning label gets ignored, the product has no webpage or the QRCode on the bottle is not clear enough to scan. To demonstrate I did an overnight lemon juice immersion on the bottom end of this tile. Then I washed and thoroughly dried it. The amount of dissolution is amazing! Metallics are made using manganese, nickel, cobalt, chrome and iron. To get a good effect 20-40% metal oxide is required.
Glossary |
Metallic Glazes
Non-functional ceramic glazes having very high percentages of metallic oxides/carbonates (manganese, copper, cobalt, chrome). |
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URLs |
https://www.astm.org/d4236-94r21.html
ASTM D-4236 - Standard Practice for Labeling Art Materials for Chronic Health Hazards - It is not what you think! |
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