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Everything posted by glazenerd

  1. My only real exposure to other potters is within these forum walls. I began my ceramic journey in late 2007/early 2008 and worked alone until Dec. 2015 when I joined this forum. I attended NCECA 2016, which I enjoyed although I left very early before most arrived. I rarely talk about pottery to friends and family; most do not even know I am involved with it. Then again, trying to hold a conversion about meta kaolin / spinel phase transitions does not go over well at dinner. However, I find myself in awe of the pieces I have seen on this site: knowing I do not have those skill sets. That's, life: I am as enamored by the chemistry of clay, as others are making their favorite pieces.
  2. And Callie! Thought Mea had an article out recently too?
  3. Congrats Mark. Now if we can get you on the cover of Scuba Diving Illustrated in your wet suit!
  4. Not one person in my family were involved in or showed any interest in art. Back in the 80's my wife would by bisq and glaze it: and the shop would fire it for her. (Cone 04). I have always loved art, went to museums, art shows, and art fairs. On a scale of 1 to 10 for artistic ability: I would score 0.50. I have tried oil painting, water color, and fooled around with stain glass: all of which eluded me. While on vacation in 2007, we stopped at antique shop in Williamsburg Va. When I saw a crystalline vase. The owner did not know what kind of glaze it was, and it took me almost a year to figure out what it was. I knew nothing about clay or glaze, but fortunately a working knowledge of chemistry. At this point, I would estimate I have read nearly 2000 hours of research papers, abstracts, and. Few dictionaries on crystalline and clay chemistry. My artistic skills are still lousy, but my working knowledge of clay and crystalline glaze chemistry is fully functional. Then again, I view a finely developed clay body a work of art. Nerd
  5. Pres: i keep an old rotary phone here, for those times when the power goes out. Cordless and push button phones will not work during power outages, rotary however will. Fortunately only had to use it 2-3 times in the last ten years. By the way, say hello to Tonto.
  6. Sure signs you are elderly: 1. Your favorite music is in the discount rack. 2. You have to explain what a record player is. 3. They give you the senior menu when seated. 4. Receptionist asks for your Medicare card. 5. AARP sends you monthly letters. 6. Your name suddenly becomes sir or ma'am. 7. Blood pressure meds becomes a hot topic. 8. Your conversation starts with; " I remember when." 9. You know who James Dean is. 10. You remember black and white TV. 11. You know how to use a rotary phone. 12. You remember The Ed Sullivan show. 13. You know where Haight Ashbury is. 14. You remember what happened to Sharon Tate, Abigail Folger, and Jay Sebring. 15. You did not grow up with central air conditioning. 16. You saw John Jr. Saluting a horse drawn casket.
  7. yunomi.jpg

    Looks to me that you have your voice dialed in.
  8. Chicken Scratch

    Joseph: one thing to remember: the more large particle additions you make: the greater the porosity of the body. If you run into weeping issues, then you will have to make fine particle additions to close up the pores.
  9. Impressive work..congrats.
  10. Vitrification

    The research done in the 50-60's has been lost in modern pottery times. Lawrence, Ougland, Brindley and a host of other PHd's long ago studied, tested, and developed the chemistry and firing cycles of clay. For instance, standard feldspars reach their peak melt potentials at 2190F, yet it is common to fire under that temp. Ougland and Brindley also studied glass formation (including mullite) and found through X-ray diffraction that peak development occurs between 1200-1250C. Once you cross the 1250C, cristobalite formation increases. Most kaolinitic bodies melt completely at cone 32. Doubt any potters will reach that temp, so pushing a clay body by a full cone is not an issue. The reason you have to test each body as correctly recommended above is due to the variance in alkali molarity. Cone six bodies can run as low as 3.30% and upwards of 3.90% alkali molarity. 3.30 requires higher temps and longer holds, and 3.90 can be fired slightly higher with no holds. So the recommendations given above are correct. When switching to a new clay, the first thing on a potters list is to test fire several bars to dial in a firing schedule for THAT body. So now you have all the techno-blather to affirm the recommendations given. For the record; on occasion you will find certain bodies that are so poorly formulated: that no amount of firing cycle corrections will cure. Mark: this cone six body probably has more glass content than most cone 10's. Absorption: 0. Shrinkage: 10.5
  11. Success equals contentment. * the worse critic of your work is you!
  12. Animals at work!

    TY DirtRoads Ms. BSA has been around for about eight years. She stays under one of the sheds now, rooming with Patches; our resident groundhog. When she hears me come outside, she pokes her head out to see if I am going to the studio. She follows me around the yard, climbs up on the corner of a work table in the studio, and sleeps in a chair on the back porch. Raccoons are docile creatures, regardless of the bad rap they get. They only get aggressive if you trap their young ins, as any mother would. She is not snarling by the way, she is chewing a biscuit.
  13. Electric-Propane kiln conversion advice

    Have not messed with natural gas or propane for kilns; but have built 100's of houses that used one or the other for heating systems. Commercial natural gas have pressure regulators that the homeowner hooks their supply lines to. Propane tanks also have regulators that your supplier would install; that you would have to hook up to. I would strongly advise you to allow your supplier to supply and install these "commercial" regulators: not something a homeowner should be tinkering with. Commercial regulators are designed to handle high pressure and their seals are rated to handle those pressures as well. Let them assume those liabilities. I have several 100lb. Propane tanks I use for temporary heat. I purchased a commercial regulator from my supplier, that I can move from tank to tank. remember also that the orifices in the burners are different sizes for natural gas and propane.
  14. Callie: I do listen to music, just not out in the studio. My primary selections come from 1968- 1978. Folk: Gordon Lightfoot: Sit Down Young Stranger, Farewell to Annabell, The House You Live In. Joni Mitchell: Circle Game, For Free ( live at the BBC 1970), Radio Soft Rock: Mountain: Nantucket Sleighride Trapeze: Medusa, Midnight flyer jackson Browne: For A Dancer, These Days, or Looking into You and of course the legendary Wishbone Ash (1968) Blowin Free English Forklore: Fairport Convention: Matte Groves. Or Traffic: John Barleycorn Blues Phoebe Snow; Harpo Blues or Poetry Man bill Withers, Boz Scaggs, Little Feat, Muddy Waters. and I listen to Dad,s stuff on occasion: Righteous Brothers, Marty Robbins, Patsy Cline, and Roberta Flack. and when I am trying to calculate chemistry.. Pink Floyd- seems fitting for brain jobs.
  15. Audrey porcelain

    Cracking during bisq firing is most commonly associated with the quartz inversion temperature. At 573 C, the clay goes through a molecular earthquake as it changes from alpha to beta quartz. That is the techno blather; in application when you fire large pieces such as platters or pieces with weight; if heated too fast during this specific temperature, they can crack or split. If you are firing smaller pieces such as cups; much less problematic. So your reference to cracking is a separate issue, and yes porcelain is more susceptible to quartz inversion than other clay bodies. there are several topics already posted: "quartz inversion" is one. Another was called "large platter splitting". Nerd
  16. Getting zinged by bisque

    Taking a brief look, I see several things that could cause or contribute. 1. Corundum has an unique crystal structure as Andros pointed out. 2. It also has a very unique molecular mass at room temperatures; much different than " normal".which would translate to differing COE to surrounding materials. 3. Synthetic corundum ( which stains are synthetic) can also produce pockets of mica crystals with the right conditions of flux/heat. These might or perhaps not play a role. If I would venture a guess, I would go with door #2. Although it is a problem, one that doesn't.t fit the text books is always interesting to ponder.
  17. Animals at work!

    Ms. Bea is not a pet, but rather a friend who stops by to visit. She brings her kids along starting in late May, and is polite enough to shake my hand when extended. She is rather fond of dog biscuits.
  18. Getting zinged by bisque

    Sputty/ Joel: noted that above. Why did it occur when water hit the piece? A " safe" assumption would be the shard was already loose, and just that mild shot of temperature change finished it off. Stains change COE, but to what degree has yet to be tested. (To my knowledge) nerd
  19. Getting zinged by bisque

    Chris: earlier this year I was experimenting with 04 porcelain frit ware. I was trimming slots and in laying different color bands. The bands would crack, with some sections falling away. So I used some 04 clear glaze, watered down with an additional 50% water and lightly coated the areas where the bands were applied. The problem ceased after that; so I wrote it down as a bonding issue due to a lack of flux. You could simply add equal parts of sodium and potassium spars to water to accomplish the same goal. You do not want or need a lot, just enough to fuse the overlaid pieces. I do however find it curious that the problem did not show up until water was used to rinse. Sudden shock/ change in expansion? The yellow and blue bands are 1/8" in depth. Not exactly what you are doing, but along the same principle.. Removed pic.. Still cannot figure out how to down size them.
  20. Prediction required

    Bentonite is redundant with that much OM 4 included. Not sure the tin is all that useful, would be tempted to replace it with titanium. Perhaps a little bleeding would make for a nice touch.
  21. Prediction required

    Interesting batch of eutectic soup. Do not have my glaze calculator handy, but from the ingredients somewhere in the satin range. Calcium and magnesium from dolomite, boron from the frit; and iron, titanium, and magnesium from the Om4. Lithium from the Gwalior spod, plus a fair amount of alumina. Om4 holds 35 grams of water per 100 grams to form a pliable ball. Thinned down for glaze, nearly 50 grams per 100 grams of clay. So drying time should have been much longer. Lower expansion I would expect due to lithium, clay, and alumina content. The OM4 is going to produce the color primarily. just label the bucket: " Frankenglaze" little electricity and it will come to life.
  22. IMG_8096.JPG

    PeQuad. Captain Ahab's ship from Moby Dick. Slight twist in spelling, but applicable name.
  23. Relay Life Update

    Christmas Post: tis the season. Neil..feel free to delete after dec. 26... Call it a Christmas card. Nature ALWAYS makes the best art!
  24. IMG_8096.JPG

    Linda: thought up a name for this piece yet?

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