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Ginny C

Member Since 02 Apr 2010
Offline Last Active Mar 17 2014 09:39 AM
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Topics I've Started

How To Dry A Slab Built Dish Evenly

13 February 2014 - 05:06 PM

I'm having trouble with cracks forming at the edge of big (14 inches in diameter, that's big for me!) hand-built dishes while they are drying. Even thickness, about 1//4 to 1/3 inch, with an added foot ring slightly thicker.  Formed from a slab, with a pattern pressed in from a basketball net, draped over a bowl covered in T-shirt material or over a pillow made from a stretchy material with polystyrene beads inside. I gently ruffle the edges, i.e. 6 ups and 6 downs on the perimeter.  Clear?

 

I drape a lightweight cloth over it and then drape plastic over that and leave it for a couple of days.  Once it's dry enough to turn over, I do that, and continue to keep it all covered.  Still, the edges get completely dry while the center stays damp, and then a crack forms.  Of course!  In both cases, the crack came where the lines had been incised, so now I'm trying with no lines near the edge.  

 

If this one cracks, I'm in trouble!  I've promised it for a charity auction, to go with a smaller piece. made the same way, but deeper.  That one didn't crack!

 

I can't figure out how to get the center to dry more quickly, to keep up with the edges.  Should I use a heat gun on the foot ring and center?  Or should I spritz the edges frequently until the center catches up??

 

Ideas, potter friends & helpers? I'll try to post 2 photos. One of the last one with a clothes pin next to one of the cracks (not bisqued) and the other of the current one, made yesterday, draped over the pillow thing. 

 

Ginny 


Why New Blisters On Re-Fired Glazed Pot?

29 October 2013 - 10:42 AM

I had a lovely bowl with one small glaze flaw/small blister crater inside. I dremeled it slightly and put a bit of clear glaze over the spot and re-fired it, again at cone 6.  Now it has blisters all over, inside and out! Ruined.  Why?

 

Laguna B-Mix cone 6 clay. Coyote's Ice Blue glaze.  One difference in the firing—fast speed the first time (although I forgot to take the prop out until late, so the lid was slightly open during the first 1700 degrees F)  and medium speed the second time.  Surely that couldn't have caused the new blisters, could it?

Ginny C.

 

 


Underglaze On Lidded Pot Lids?

29 September 2013 - 02:33 PM

Will regular underglaze on leather hard clay applied to the rim of the pot and its lid cause them to stick together if fired together in bisque firing?

 

ginny c


Fixing A Slightly Warped Wonderbat

03 September 2013 - 04:13 PM

I have used and loved my wonderbat with 6 square inserts for 3 or 4 years and stored it properly on its edge, but suddenly it won't seat completely level on the wheel head. There's a very slight wobble.  I cannot find a website for the manufacturer, Rocky Mountain Wood masters, but someone at Clay-Planet told me to wet it and weight it down on something level.  Before I try that, I'd like to know if any of you has experience with this product.   (I know that some have written in the past that this kind of bat isn't worth it, but I have found it delightful to use. I don't ever throw more than six items in one day, so I haven't had need for more inserts. I enjoy not having to remove a piece right away, and they save space on drying shelves. And I can easily remove the square from the round by sticking an old apple corer into the corner space. Works perfectly to lever it up!)

 

If I try this, how wet should I get the bat?

 

Love this community, by the way!

 

Ginny C


How To Use Some Ocre Rouge

30 August 2013 - 01:37 PM

My son sent me a 150 ml jar of "Ocre Rouge" (red ochre) from southern France, where it is dug right from the cliff he's sitting on in a photo he sent. Red to orange to yellow rock with his matching yellow shorts!

So, how should I use this in my studio? I do not make my own glazes, but I assume I could use some of this powder to color some of my white B-Mix cone 5 clay or use it as a wash over bisqued clay. It doesn't look like typical red iron oxide, but I know it is some version of iron oxide. Anyone familiar with this? Ideas?

 

The slip of paper that came with it mentions using it in ceramics, among other things, but there are no details there or on the company website.

 

Thanks for any suggestions!

Ginny C.