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Translucent Plates

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Matt Oz, a few quick questions after browsing your profile gallery. I should probably know this but don't, are you Matt of Matt and Dave's Porcelain? Are you still working with that special porcelain that is almost glass? Are you adding glass, more silica or?

 

Jim

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Matt, Jim's post caught my interest. On your site you said your porcelain best fired in a mold. My question is, does the porcelain slump any into the press mold. If so it would help cut down on warping. One other thingshould it be fired to cone 6 bisk then refired to a lower  06 to 04 glaze firing like bone china?

Thanks looking forward to testing on some jewelry

Wyndham

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Matt Oz, a few quick questions after browsing your profile gallery. I should probably know this but don't, are you Matt of Matt and Dave's Porcelain? Are you still working with that special porcelain that is almost glass? Are you adding glass, more silica or?

 

Jim

 

Thanks for the interest Jim,

 

No I'm a different Matt. I'm still working on the glassy porcelain (I say glassy because it doesn't need a glaze, unless I want it really smooth) almost done, it's close to what was used in the old days to make porcelain teeth, high in feldspar low in kaolin. It slumps to much for normal potting, but if your missing any teeth I could probably help you out.

 

One thing I found out doing this, there is a point when your trying to maximize translucency where you lose whiteness (because it's basically on the verge of melting into a clear glaze), I ended up having to add opacifier if I wanted a good white.

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Matt, Jim's post caught my interest. On your site you said your porcelain best fired in a mold. My question is, does the porcelain slump any into the press mold. If so it would help cut down on warping. One other thingshould it be fired to cone 6 bisk then refired to a lower  06 to 04 glaze firing like bone china?

Thanks looking forward to testing on some jewelry

Wyndham

 

The glassy porcelain does slump into the mold so I decided to take advantage of that and do porcelain slumping. To make the plates I have been making flat discs setting them on top of the molds and firing to cone 6, the clay slumps into the mold and takes the shape of a plate with no warping like you mentioned. So the clay doesn't stick to the mold, I coat the bottom of the discs with a thin layer of normal porcelain and the mold with alumina, the bottom comes out looking like unglazed porcelain but luckily that's popular at the moment. This method seems to work best in shallow molds.

 

I could fire it like bone china but for now I'm trying to once fire or have a really low bisque, and just except that the bottom will look unglazed.

 

The recipes on my blog are pretty much a standard cone 6 porcelain, slumping isn't as much a problem with those. The recipes are sorely are out of date, I just threw them up there if someone wanted to mess around with them. The glassy porcelain recipe I haven't decided what to do with yet.

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matt, beautiful work!

 

yes, i need a tooth.  lost it in 1967 when i could not afford a $75 root canal.  (didn't know i had a choice.)  and today i need an apicoectomy and $1300!  

 

how are you going to use this marvelous porcelain to help tooth repair?

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my brother and sister in law are both dentists and when I need teeth i just ask them! When i get to my big computer I will post a hare i did with a mouth full of said teeth. T

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matt, beautiful work!

 

yes, i need a tooth.  lost it in 1967 when i could not afford a $75 root canal.  (didn't know i had a choice.)  and today i need an apicoectomy and $1300!  

 

how are you going to use this marvelous porcelain to help tooth repair?

 

Thank you for the compliments.

 

I was thinking of starting up my own back alley business, 20 bucks a tooth. Don't worry everything is sterilized and numbed with whiskey.

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matt, beautiful work!

 

yes, i need a tooth.  lost it in 1967 when i could not afford a $75 root canal.  (didn't know i had a choice.)  and today i need an apicoectomy and $1300!  

 

how are you going to use this marvelous porcelain to help tooth repair?

 

Thank you for the compliments.

 

I was thinking of starting up my own back alley business, 20 bucks a tooth. Don't worry everything is sterilized and numbed with whiskey.

 

Sounds like the way they do things, in Jim's neck of the woods.

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matt, would your recipe for cone 6 porcelain work for lithopanes?  i would love to use a transparent body and use it in the mold i made of raku clay bisqued to 04.  i am sending a picture of it and of an impression done in little loafers cone 6 stoneware.  

 

can you suggest a way to create the impression and fire it? i assume that i  will i have to fire it in the mold each time i want a copy.  i can picture  firing it to cone 6 as it is so it would finish shrinking.  i am just afraid that once i use it to hold the porcelain i will lose the mold for any other use and i cannot make another one until the flowers bloom next spring.

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Lithopanes would be a great idea.

Wyndham

 

Yeah, I've always wanted to do some but never got around to it. I've put paper in Frost and cast it so that it is paper thin and so translucent that approaches transparency.

 

Jim

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matt, would your recipe for cone 6 porcelain work for lithopanes?  i would love to use a transparent body and use it in the mold i made of raku clay bisqued to 04.  i am sending a picture of it and of an impression done in little loafers cone 6 stoneware.  

 

can you suggest a way to create the impression and fire it? i assume that i  will i have to fire it in the mold each time i want a copy.  i can picture  firing it to cone 6 as it is so it would finish shrinking.  i am just afraid that once i use it to hold the porcelain i will lose the mold for any other use and i cannot make another one until the flowers bloom next spring.

 

Why don't you just do it in a transparent porcelain like Frost or NZ6 instead of Little Loafers. You will not have to fire those in a mold and where the piece is thin, it will be very translucent.

 

Jim

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Oldlady - what a beautiful mold/impression/design(?) not sure what to call it but its wonderful how did you make it? I haven't even begun to think about making molds of any kind I'm still at the oh look a plastic tray I can use as a mold stage. And then using that takes me 2 tries to get both sides of the clay smooth and unblemished lol.

 

I love this forum not a day goes by that I don't discover something new and interesting that I want to try. Sometimes I just sit in awe wondering if I'll ever get good enough to try some of the stuff the people on here do everyday and take for granted.

 

Matt- Those plates are amazing by the way!

 

Terry

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matt, would your recipe for cone 6 porcelain work for lithopanes?  i would love to use a transparent body and use it in the mold i made of raku clay bisqued to 04.  i am sending a picture of it and of an impression done in little loafers cone 6 stoneware.  

 

can you suggest a way to create the impression and fire it? i assume that i  will i have to fire it in the mold each time i want a copy.  i can picture  firing it to cone 6 as it is so it would finish shrinking.  i am just afraid that once i use it to hold the porcelain i will lose the mold for any other use and i cannot make another one until the flowers bloom next spring.

 

I like lithopanes too, the little TV in my gallery uses a very primitive one. I have done some tests and the clay I used for the plates looks like it will work for lithopanes, but I'm just not there with it yet. The recipe on my blog that uses 50% kaolin is just your usual porcelain, other than I use Veegum T to make it more plastic, so like Jim said Frost or NZ6 is the way to go.

 

----

Terry - Thanks

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thanks, i haven't had any muscle power come by lately to get the Frost out from under the other two boxes on top.  will try it, any suggestions for shapes?

 

thanks, terry, i like using plant material.  i used some of the leaves that i can only get in florida (they actually come from a plant native to Hawaii) to make trays with interesting edges. found the original leaves at the dump when i took a dead tree there.   the trays all sold and i have been looking for a substitute.  nothing is the right size or right weight to do similar trays but i will continue.

 

 the mold is merely a thick, about 1/2 inch tile that is sized to fit the shelf in my kiln.  i tried little loafers first but it cracked three different times.  this one is in Raku clay and it did not crack as badly, there is a thread sized crack in part of it. i rolled the geranium leaves and flowers in, leaving space for the dragonfly.  that is a piece of jewelry that i put some epoxy on to make a handle so i could get it back out after impressing it.  it is dipped in WD40 first.

 

bciske does marvelous things with hosta leaves.  and my friend denise makes bowls from them as well.  looking for just the right flower or leaf is a good way to get to know your neighbors who garden.

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