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Glazed Inside

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#1 CLN studios

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Posted 06 May 2014 - 05:22 AM

Okay. Is it "okay" (safe) to leave outside surface unglazed and the inside surface glaze? Since it is stoneware and porcelain mixture i would think that it okay since it is vitrified (i did the vitrification test and it has >1%) and i thought the only purpose of glaze was to protect the decoration. 

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#2 Pres


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Posted 06 May 2014 - 06:20 AM

I don't think that is a problem, personally. The pots if fired to temperature should work without a glaze, but a glaze makes things easier to clean, feel better to the touch especially around the lips, and deepens the surface. However, if for aesthetic reasons you with to leave a surface unglazed as in the outside, go for it.


Oh and I did delete the second posting of this query.

Simply retired teacher, not dead, living the dream. on and on and. . . . on. . . . http://picworkspottery.blogspot.com/

#3 CLN studios

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Posted 06 May 2014 - 06:51 AM

Thanks for deleting it. Ill be sure to put the glaze over the lip to assure coverage (for the lips) i think its interesting to have to 2 textures, smooth interior and satin on the outside

#4 Marcia Selsor

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Posted 06 May 2014 - 07:25 AM

I think the purpose of glaze also helps in cleaning. Just a thought. If it is functional ware, customers may not get the aesthetics of the contrasting surfaces.

Marcia Selsor, Professor Emerita,Montana State University-Billings

#5 williamt


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Posted 06 May 2014 - 11:22 AM

Even though the ware is vitrified, it can still collect skin oil, cooking oil, stains on the unglazed surface. Over time, even with washing, this might make the outer surface unsightly. It is also possible for bacteria to inhabit the little micro pores in the surface. For the most part though, if it is really smooth, it can be kept sanitary.

You might try the "sharpie" test. Take a sharpie marker and draw on one of your culls, then see what it takes to remove those marks. Sometimes it's surprising how porous, non porous surfaces can be.

Lee Tucker
Black Kitty Pottery

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