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glazenerd

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About glazenerd

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    Clay chemist

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    Male
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    St. Louis, Mo.
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    Crystalline glaze chemistry. Been stuck in clay chemistry and formulation. Writing formula limits for porcelain, stoneware, and low fire bodies. Developed new cone 04 colored porcelain body, cone 6 porcelain, and cone 10 bodies for public use.. 60yrs old.

    Email: optix52@aol.com

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  1. Lepidolite

    Anyone know a USA source for lepidolite. (Mica/lithium rich mineral) --- not finding anything. Tom
  2. L&L easy fire front loading kiln

    I happen to like front loaders, and yes they save the back. I find they heat the body very well on colder days. Cook turkeys for 60, roast two pigs, or boil 100 dozen eggs. No elements in this door either, which is okay as long as you are not firing highly technical glazes like crystalline. The top upper right corner is slightly higher, and the lower front ledge is slightly colder because it draws some air at peak temps: when static heat pushes the door open ever so slightly. Does great for cone 6, the temperature variances are not great enough to effect a standard cone six melt. This Paragon Super Dragon is just over 15 CF and holds lots and lots of pieces. It has 3" brick with 2" fiber insulation. Notice the 400 amp panel right behind it: it does draw some power.
  3. Highwater clay users

    Mea:the reply from Highwater. Hi Tom, Thanks for your concern. I have been in touch with the member that originally posted in that thread to assure her it is just a water issue-we don't use bentonite or plasticizers in Little Loafer's. That clay gets very sticky when it has too much water and that might be ok for throwing but is frustrating when trying to work with slabs. It also takes a long, long time to dry due to the fine grain nature of the clay, moisture does not easily wick out. The supplier she bought it from originally had several pallets from the same batch and hasn't heard from other customers about problems. Same with the clay that he replaced it with, so I think if there had been an issue with the clay being thixotropic related to water quality it would not have been isolated to just her boxes. Thanks again and have lovely Thanksgiving, Jennifer Hoolihan Ceramic Technician & Workshop Leader Highwater Clays, Inc 600 Riverside Dr Asheville NC 28801 828-252-6033 Please visit our website www.highwaterclays.com On Wed, Nov 22, 2017 at 10:41 AM, Denese Hollifield <clay@highwaterclays.com> wrote: Hey Jennifer, Jonathan said to forward this to you. If you open up the link, you can see the various complaints. Thanks, Denese ---------- Forwarded message ---------- From: <optix52@aol.com> Date: Tue, Nov 21, 2017 at 12:48 PM Subject: Recent complaints about products. To: "clay@highwaterclays.com" <clay@highwaterclays.com> I am a member of the Ceramic Arts Daily Forum group. In the last month there have been several complaints and questions about your products on the a Forum. I have provided one link in perticular: http://community.ceramicartsdaily.org/topic/16852-highwater-clay-users/ I thought you should be made aware of these issues, most of which strike me as excessive moisture content. Tom Anderson Sent from my iPad
  4. Highwater clay users

    Mea: here is a copy of the email I sent to Highwater clay. Co. I am a member of the Ceramic Arts Daily Forum group. In the last month there have been several complaints and questions about your products on the Forum. I have provided one link in perticular: http://community.ceramicartsdaily.org/topic/16852-highwater-clay-users/ I thought you should be made aware of these issues, most of which strike me as excessive moisture content. Tom Anderson Sent from my iPad
  5. Yes Mea, I will do exactly that. From the complaints that I have seen in the last month: sounds like a simple matter of too much water? However, the tacky/ sticky reports relate to ball clay levels, or even perhaps a change in ball clay supply. Every clay supplier out there hits a bump in the road at some point- who hasn't? Mea: email sent with specific links to relative topics.
  6. Third Highwater clay issue in a month. Since you are using a white stoneware body, even more prone to believe it is soluble salts. The lack of mold smell in your throwing water is also telling. Made a prediction in another thread recently that clay issues would out pace glaze issues in the years to come- perhaps sooner than I expected. Someone at Highwater needs to do some batch testing. by chance was this clay wetter than normal? Tacky? Nerd
  7. John: easy enough to test- couple of drops of vinegar that foams up- salts.
  8. Okay, so now I am curious? Does your throwing water or pieces shown have the classic mold smell? High organic content ball clay would produce this kind of mold, but the body is usually much darker. This does remind me of soluble salt migration as well.
  9. Titanium, calcium, iron clay body

    Blending various blends of raw clay to set levels of titanium, iron, and calcium. The goal was to produce purple in oxidation: without the use of stains. A band of rutile was placed in the center, and Temmoku glazed over.

    © TJA 2017

  10. The issue with Laguna Iron Phoenix glaze...

    Glaze chemistry begins to matter when your glaze starts peeling off your pot. What you breath in does matter: in 1978, I worked on a rehab job in South St. Louis city. Every day, we would use a compressor to blow off all the dust that accumulated on us from working. After a month, a city inspector shut down the job once they figured out that dust was asbestos . All the overhead pipes had 4" pure asbestos pipe insulation. Back in the days before asbestos became a big concern, and masks were an after thought.
  11. The issue with Laguna Iron Phoenix glaze...

    I recall getting an email forwarded from Laguna, by my supplier. They were looking for crystalline glazers to test several new zinc varieties. Their existing supplier ( Horsehead Cerox 506) had discontinued production, and they were testing four new zinc products. One from China, and three from Zinc Nationale (Mexico) as I recall? They had been using a white French process zinc that was giving them some issues. White zinc is French process that will begin vaporizing at 2260F +/- (tested). Yellow zinc is sphalerite (American process), which can fire up cone 11 without issue.(tested) You may very well have gotten a batch during this period of transition? The ingredients in the MSD sheet only add up to 70% or so, which means 30% of something is not listed. Most likely Nep Sy, which has 14-20% soluble salts pending mineral source. Sodium will certainly form crystals as it sits, which if discarded during sieving would alter the flux level in the glaze. If enough sodium, along with lithium crystals were sieved out: it would effect the melt and clay/ glaze interface.
  12. Remnants from the Garden3.jpg

    Really like the detailing on this piece.
  13. microwave proof?

    Relative to this topic: a niche where clay becomes as important as glaze or firing. Oven ware, flame ware, or by application: microwave "proof." Every time you heat a pot, rather by heat or microwave, you are dealing with expansion and contraction. It is one thing for a coffee mug to get a quick shock of heat, and another for a piece to be subjected to increasing amounts of heat over an extended period of time. what Chilly and Joseph added is relative: but in this case so is the clay. Ovenware, flame ware clay bodies are low expansion: 4.25 up to 4.75 median average. The lower expansion of the clay, the more resistant to shock it becomes. Wall thickness also comes into play: the more clay present equals more clay that expands. The lower COE clay also means extensive adjustments in COE in the glaze of choice to fit it. Spodumene will quickly become your friend, should you venture down this road. I will let others work the glaze side of this equation, being a clay guy primarily. nerd
  14. "Get the excess clay out before you raise..." expound please.. Apparently I am missing this info.
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