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Hello! This is my first post after reading so much fabulous and useful advice on these forums the last couple of years. I'm still a bit of a newbie potter and I've been selling for just over a year. So far I've been really pleased and no complaints or negative comments (exception: why don't you make in blue?) LOL. So I sent off a pair of mugs (Etsy sale) and the new owner is really happy with them, except that he just tried to microwave one to reheat his beverage, and he heard some "pinging" noises. He was alarmed and took the mug out and didn't try again; he's just wondering if I know what is going on. The details: I use Tuckers Pottery 6-50 cone 6 porcelain clay. I fire to cone 6 based on witness cones. (I use cone 7 in the kiln sitter to get there). Glaze: I am making my own glazes. The liner glaze in these mugs was an Assad Opalescent (basic high percentage frit based glaze with no added oxides). Outside was a floating blue glaze (from John Britt's book of Cone 6 glazes: Floating Blue #2) I've used both of these before and have been very happy, and I've personally have had no problems with anything in my home. Unfortunately, I have sold everything at this moment that has this exact glaze combo. Also not sure if a mug done the same isn't necessarily going to be a perfect "test" as glaze thicknesses, exact kiln position, exact top temp, etc may be slightly different? Any advice would be really appreciated! Mostly I'd like to know if in *your* opinion I should tell this buyer not to try to nuke these mugs? I know I've been a bit "reckless" in claiming my things are microwave safe and I'm sorry now I did without being more sure. I've read the forums about the astm standards and I plan to at least test more carefully than just a few things I have at home. Thanks in advance! Cheers, Lorraine.
For the last year all of the mugs I've made, no matter how long they've been around for, make a strange pinging sound. It sounds like someone taping on them with a small metal object. almost like some hitting a chime. We thought it was just long term cooling, but these have been around for 6 months. My kids say it's a ghost tapping on the glasses. You'll be sitting next to the mugs and you'll hear a small soft, "ping....", "Ting....", "Ting, Ting...." Sometimes it sounds like a song when there's a bunch of mugs on the table. Is this just ceramic chemistry or do I need Ghost Adventures??? -Alex
We just tried to fire a newly bought glaze that required 1160 degrees on stoneware that is labelled 1100 - 1280 degrees. The kiln was opened at around 250 which we have done many times in the past. However, this time we heard several pinging sounds from the largest stoneware piece, so we immediately closed it until it got under 200. Then we propped open the lid with a brick until it got down to 100. All the time we heard the pinging sounds. At around 70 we removed all pieces and they were fine, except the largest one that kept "pinging" away. So we wrapped it up in a large piece of cloth and kept it like that overnight. Today, almost 24 hours after it has gotten down to room temperature, it still "pings"! Some bone china pieces did spontaneously shatter with a glaze from the same manufacturer, but that happened within minutes of them becoming room temp. This large piece has lasted way longer now. On another forum someone said we should tap it and see if it rings out like a bell or if it only produces a dull noise, which means it's internally cracked, but it does ring out like a bell still. We've heard that the glaze apparently isn't compatible with the stoneware, but does anyone know what we can expect? Will it spontaneously shatter a week from now, a month, a year? EDIT: WRONG FORUM! My mistake. Can a moderator please move this to the "in the studio" forum? Thank you!