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Member Since 08 Sep 2012
Offline Last Active Today, 03:28 PM

#68577 Exploding Pots During Glaze Firing

Posted by Benzine on Today, 10:31 AM

Exploding, during the glaze firing?  I've never heard of that happening.  


Why do you wet spray the wares?  Is it to control the spray application?  I don't spray glaze, so that's not familiar to me.


The general reason things explode in the kiln, is due to moisture, which is why it happens in the bisque firing.  Bisqueware has no moisture, so it shouldn't explode.  Glaze doesn't have much moisture in it.  I've put freshly glazed wares, in the kiln, and fired them immediately with no issues.  It is possible to have some glaze defects arise, from doing so, but it shouldn't affect the ceramic body at all.


If the body was saturated with water, and you tried to glaze fire it, they could theoretically explode, much like how certain kiln shelves will do the same if they get wet, and aren't dried properly.  

However, you seem to be bisque-firing to the clay's maturation point.  It shouldn't be that porous, when you go to glaze.  So I really am not sure what's going on.


I guess I should ask, what the wares look like.  Are they coming completely apart?  If they are just cracking violently, it could be a glaze fit issue.  The glaze is shrinking more than the body, and the glaze is it to fracture.


Trying posting some pictures, and others may be able to help.  I'm stumped.

#68492 Well Said

Posted by Benzine on 23 October 2014 - 10:50 PM

I guess we can all interpret this our own way. When I read this, I did not detect anyone saying "poor me." I detected a person who was dedicated and proud of himself/herself.


I'm with you Mea.  I didn't read it as "Guilt Trippy" at all.


 Puts us miles ahead of those who just work to make money and live for the weekend.



Now I've got the song "Everybody's Working for the Weekend" in my head.

#68489 Pictures Of Your Studio

Posted by Benzine on 23 October 2014 - 10:28 PM

Very nice set up Marcia.  I'm guessing the Texas summers are still thawing you out, from the Montana winters.


perkolator, great pictures of the studio.  The wide angle shots, really give me a feel for the space.  The fact it used to be Army barracks is excellent.  I love it when a structure has a history.  


It is indeed sad, to see so many projects discarded.  I understand the reason(s), but it's still unfortunate.  Only one of my college projects, ever met the hammer.  Now it's serving as erosion prevention, for a creek in my parent's backyard.  The upper level students, at my college, almost always smashed their rejected wares.  They didn't want anyone dumpster diving, and pulling them out.  And believe you me, there were Art students looking through dumpster, for any type of free materials!


Why go so large though?  Can't they learn the same processes and techniques, on a smaller scale?  They'd be less likely to to their works, if they were more portable perhaps.  

I makes my high school students take everything home, or at least out of the school.  I don't let them throw anything.  I tell them, if I see it in the trash, anywhere in the school, they will receive a zero.  Because they are telling me, that it wasn't worth their time, my time and the department's materials.  If they don't care, why should I?  Once they have them home, they can do what they want.  Many times, their parents see a project, and snag it, before anything "accidentally" happens to it.

#68311 Underglazes Flaking Off

Posted by Benzine on 21 October 2014 - 05:57 PM

Neil, I'm inclined to agree, that there is something on those spots. I haven't the foggiest what it could be. What would not have burnt put after the first firing, that could still be causing glazes to pull away from the claybody? Angry Kiln God magic, is the only conclusion I've reached. I would leave a shot of alcohol out, but the school will probably frown upon that, and my answer of "It was for a kiln god offering, will not probably help matters...

#67566 How To Complete A Mistake? Please Help

Posted by Benzine on 10 October 2014 - 01:36 PM

I didn't find Min's post to be condescending at all.
The "Air pockets cause explosions" myth is one that has been perpetuated for a long time. I myself am guilty of spreading it, as that's what I was taught. In fact, the only reason I know, and now teach otherwise, is because of discussions we've had on these forums.

Min clearly and respectfully stated the information. A hole is not necessary, but will expedite the drying process. I put holes in all my sculptures, and hollow out thicker portions, for this reason.

#67539 Fall To Winter Projects

Posted by Benzine on 09 October 2014 - 09:30 PM

Excellent chalices Pres.  I've helped students make some, but oddly enough, I've never made one myself.  


I've heard you mention making the chalices and patens before.  It recently occurred to me, how many churches can there be around you, that there is a constant demand for those?


Babs, in regards to the clay pumpkins, I found this:


#67394 Fall To Winter Projects

Posted by Benzine on 07 October 2014 - 11:30 AM


That's a good solution for Pres, but as I understand it, prepping wood for a stove is like having a part time job. Hauling the wood, chopping it, stacking it, then consistently feeding the fire. It's like having a kid!.... No I am not saying that I chop and stack children, just that there is a lot of work involved to have them.

#67137 Everything In This Photo Sold At 1 Day Festival... Why?

Posted by Benzine on 02 October 2014 - 04:51 PM

Your work is great, and people like Fall.... It's the last time of the year that people can enjoy the weather, before Winter ruins everything.

#66813 My First Show!

Posted by Benzine on 28 September 2014 - 09:41 PM

I'm glad your first show experience was positive overall.


I like the green glaze you posted as well.  It has a nice "oxidized" look.


And in regards to mugs, I always tell my students, that it is my believe, if a mug can't hold a large can of "Chunky" soup, it isn't nearly big enough.  I like my mugs to be multi-purpose; soups, ramen, cereal, ice cream or just a butt load of caffeinated beverage.

#66711 What Is Causing The Black Zits In My Glaze?

Posted by Benzine on 26 September 2014 - 09:28 PM

I too like the look. Nice mug.

#66442 Which Do You Prefer For Joining Process?

Posted by Benzine on 20 September 2014 - 08:48 PM

What is "magic water" and what is the purpose or property of the vinegar-and what kind of vinegar, in what amount? I have always used straight up slip with no problem, but this is interesting. Thx.

Magic Water is a mixture of water, sodium silicate and soda ash.  The sodium silicate helps the clay "fuse" together.  I've never used it myself, but I'm told it works great.

#66157 I Want Porcelain!

Posted by Benzine on 14 September 2014 - 06:49 PM



You're not far from me, there in Ames.  I use Continental Clay, for my supplier.  They have good prices, and do good at keeping shipping costs low.  There is also Minnesota Clay.  I've never used them personally, but hear they are pretty good as well.  

#65872 Have You Ever Done A Crazy Experiment Just To See What Happens?

Posted by Benzine on 09 September 2014 - 05:03 PM

That is why so many potters are centenarians!


Because they enjoy it so much, or because they are still proving to everyone that it wasn't a crazy decision?


And I really don't recall the smell of the burning pumpkin.  I'd like to say that it smelled like pumpkin pie, but that probably wasn't the case.  I was also doing some traditional (Well, Western "Traditional") Raku in reduction with newspaper.  So I mostly smelled that.  The one I did last Fall, I tried drying the pumpkin a bit, after cleaning it out.  This year, I will do no clean at all.  I will leave all the strands, seeds and general "guts".

#65833 Have You Ever Done A Crazy Experiment Just To See What Happens?

Posted by Benzine on 09 September 2014 - 05:43 AM

Yep, took a hot, glazed Raku piece, and used a hollowed out pumpkin as a reduction vessel.

That's where I stopped then, because it was late last Fall, and was my only leftover pumpkin. I've got a good size one, from the garden, I may try this Fall.

#65269 Copying ... Myself!

Posted by Benzine on 28 August 2014 - 06:51 AM

Sometimes a dog does catch its tail Pres. And this is hilarious, because they don't know what to do next..... I'm not sure if this extension of your analogy still applies to your point, but it's too early for me to think.