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Gunmetal black mug demos liner glazing:

Safe glaze inside, pigmented matte outside.

The outside glaze is G2934Y cone 6 black. I use the C6DHSC slow cool firing schedule to get this degree of matteness in the black. The body is the natural MNP (Mother Nature's Porcelain), it vitrifies to zero porosity around cone 4 (yet is stable to cone 8). At cone 6 it produces incredibly strong ware and works well with these two glazes. The inside liner glaze is GA6-B (made using real Albany Slip rather than Alberta Slip in this case). Although the melt characteristics of these two glazes are so different they can be applied to meet in a perfect line at the rims of pieces. Food safety labelling is not what you think it is - do liner glazing to be safe.

Mother Nature's porcelain black mug

Related Pictures

Meet two glazes at the rim using wax emulsion. Why? How?


Liner glazed mug

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Reactive glazes (melt-mobile, crystallizing or heavily pigmented) are the least suitable for food surfaces because they have the potential to leach metals. Liner glazing ware is an excellent way to deal with this problem. Not only does this approach improve functionality but it can be aesthetically pleasing and practical in production. This liner is GA6-B, a pottery glaze recipe we promote with confidence. Not only is it less likely to be leaching metals but also less likely to craze - this assures water tightness on non-vitreous bodies and eliminates any potential for bacteria growth in the cracks (especially if the body has porosity). Unfortunately, glazes that leach are also likely to stain and cutlery mark - these add more reasons why they are most often unsuitable for food surfaces. The straightness of the dividing line is affected by both the application technique and the degree to which the two glazes bleed into each other and run. Read and watch our liner glazing step-by-step and liner glazing video for details on how to do this - it is practical for any potter or hobbyist (or even in production). And tap/click the picture above for other examples of this.

Feeling good about the glazes we use on functional surfaces


Val's Turpquoise glaze chemistry

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The chemistry of the popular cone 6 Val's Turquoise glaze surprised a customer recently (when she was comparing the Gerstley Borate and Gillespie Borate versions). Here is what she said initially about using this on food surfaces:

"I’ve noticed the alumina is below the suggested limits. I have read that too low alumina can cause a glaze to be more prone to leaching, especially with the addition of copper carb. I’ve soaked samples in vinegar and lemon juice. I’ve also run pieces through the dishwasher several times with no visible changes."

Her concerns about this chemistry anomaly are valid. This glaze has no clay, that is very strange, clay sources vital Al2O3 that imparts durability. The little Al2O3 there is being sourced by lots of feldspar, that is a red light for crazing when little MgO is present (from talc or dolomite). Of course, even if this glaze does leach, the copper is not going to hurt anyone. However, if another heavy metal pigment were added the Cu could destabilize it enough to make toxicity a concern.

Her final comment was this: "I never want a customer coming back to me with a faulty pot. I just want to do everything within my power to make the best ware that I can - which includes a durable, reliable and functional glaze."

Videos

Links

Materials Albany Slip
A pure low plasticity clay that, by itself, melted to a glossy dark brown glaze at cone 10R. It was a popular glaze ingredient for many decades.
Glossary Liner Glazing
Step-by-step to apply inside and outside glazes to a pottery mug and get them to meet at a clean line at the rim.

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