Green Glazed
Posted By admin on July 5, 2010
Green Glazed
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 Ancient Egyptian Sesh USHABTI Black Detail Hieroglyphs Amulet Intermediate 900BC $349.00 Time Remaining: 1d 1h 54m |
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 Islamic Sgraffito green glazed pottery plate dish $1,750.00 Time Remaining: 25d 17h 28m Buy It Now for only: $1,750.00 |
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 Pair Huge 126 stone lucky Fu Foo Dog guard Statue $330,000.00 Time Remaining: 21d 1h 11m Buy It Now for only: $330,000.00 |
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 Authentic Ancient EGYPTIAN Faience Ushabti Figurine 300BC Artifact Greek Kingdom $175.00 Time Remaining: 9d 9h 55m Buy It Now for only: $175.00 |
 ANCIENT EGYPTIAN USHABTI 30th DYN $91.66 Time Remaining: 21d 18h 28m Buy It Now for only: $91.66 |
 Antique kashan ceramic green oil lamp c13th century AD $11.50 (2 Bids) Time Remaining: 1d 18h 10m |
 Scarab decorative figurine Statue XXLARGE sculpture $6.99 Time Remaining: 26d 16h 34m Buy It Now for only: $6.99 |
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 Ming Dynasty Shipwreck Petals Plate Annamese Stoneware $529.00 Time Remaining: 17d 11h 16m Buy It Now for only: $529.00 |
 Authentic Ancient EGYPTIAN Faience Ushabti Figurine 300BC Artifact Greek Kingdom $315.00 Time Remaining: 9d 9h 57m Buy It Now for only: $315.00 |
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 Ancient China Earthenware Glazed Jar Han Dynasty 200BC $199.99 Time Remaining: 10d 3h 33m Buy It Now for only: $199.99 |
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 c1850 Persian Tin Glaze Faience Pottery Mid Pan Candlestick Qajar Isnik $79.00 Time Remaining: 2d 4h 19m Buy It Now for only: $95.00 |
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 Antique 19thC Famille HandPaintedPorcelain Snuff Bottle $69.99 Time Remaining: 17d 3h 24m Buy It Now for only: $69.99 |
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 Antique kashan ceramic green oil lamp c13th century AD $71.10 Time Remaining: 26d 20h 58m Buy It Now for only: $71.10 |
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 Very Rare Osiris God of the Dead Bronze Statuette 500BC $499.99 Time Remaining: 3d 2h 2m Buy It Now for only: $499.99 |
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Is this safe to drink from? (clay, mug, glazed)?
So I made a mug and it is glazed. I used green-ware clay, I'm not sure if it's safe to drink from. The mug ended up having bubbles from the glaze. So there are small hole where fired green-ware clay is showing. I guess it's because it popped when it was getting fired in the kiln room.
So is it safe to drink from it?
The only way to know if it is safe to drink from, is to know the chemicals and their amounts in the glaze. These days lead is not usually part of a glaze for functional ware, especially if it was fired at a school. So it is probably safe. However there are sometimes glazes that are soft and leach out heavy metals (chemicals in the glaze, usually the colorants). The best way to know if there is a problem is to test the glaze.
As far as the bubbles, if they are tiny, it is a glaze defect called pin holing. It can happen when gases are released during the firing through the glaze, and there isn't sufficient time for the glaze to smooth over and "heal." This shouldn't be a problem. If the bubbles are bigger, the size of a pencil eraser, then they are called blistering and they could be sharp and possibly cut you (see photo on link).
With the clay showing through the bubbles, it could be harder to clean. So be careful when you wash your mug.
I teach and have fired kilns for many years. So if this happens I fire the piece again and hold it at the end temperature to heal the blisters or pin holes. But sometimes re-firing doesn't work, especially if it is that particular glaze combination that is acting up.
You may want to use your mug as a pencil holder on your desk and make a new mug if the bubbles are bad. Hope this helps.
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