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Everything posted by glazenerd

  1. Sneaky? I thought is was rather overt myself. Besides, it is viewership round up month. premium porcelain is 50% grolleg, 25% silica, and 25% Nep Sy. + 2% macaloid (Bentone ma) this is the fix it mix. If you do not have grolleg, then use EPK. EPK will diminish translucency a bit- your call. how much fix it mix you add is directly proportional to the amount of water you use throwing, which equates to how much fines you lose. So you have to make that judgment. For a gallon full of dried reclaim 1/8-1/4 cup of fix it mix will work. Most of the members post pictures of the
  2. Dearest Oldlady: coleman porcelain actually originated from experimental bodies used at Alfred. This article covers clay recycling, and Coleman in perticular. Premium cone 10 porcelain is 50% grolleg porcelain, 25% silica, 25% Nep Sy, and 2% Macaloid. (BentoneMA) instructions are in the article https://ceramicartsnetwork.org/ceramics-monthly/ceramic-supplies/ceramic-raw-materials/techno-file-clay-restoration/
  3. A recent thread on culture made me think about periods of art history. Being an arm chair historian, I often go through the history of potters before us: Adelaide Robineau's Scarab Vase comes to mind. Historians put art (including pottery) into periods: Medievel, Renaissance, Baroque, and Neo-Classical for instance. (Google "periods in art history"- you will find them) Each period in recent history lasted 100-200 years: the current period began in 1800. So if periods last 200 years, that would mean beginning in 2000, a new period should have begun.....but it has not! Qotw : what name wo
  4. Controlling the rate of drying has been on my agenda for a few years now. Couple of years back I was mixing a wetting agent into porcelain in an attempt to control it: those who got samples know how badly that flopped. so I have been working on a spritz made mostly of organic/food safe materials. To date, I have extended drying time by roughly 30%. When I get up to 50% or so, I will unveil it. However, I have no laboratory rats to test toxicity on, so PM me if you want to volunteer to drink a cup or two. ( that was Westerner joke by the way). T
  5. Been following this topic, but I know just enough about Japenese/Chinese/Korean culture to say something wrong. One of the many times I wish Baymore was around: these cultures were his speciality. Being a Westerner, I will add a twist to it. Modern technology has managed to put most of the worlds population onto a single stage/platform. The assimilation of culture that once took centuries, now only requires a mouse click. Marco Polo bought back porcelain pieces from China: and Europe spent 500 years trying to replicate them. Any potter can click Sung/Ming dynasty and start throwing in an
  6. Mahavir potash is the closest spar to Custer. Of course testing is required.
  7. Lee: let me give you an example of being me. YOU form your favorite stoneware clay and notice how pliable it is, how it takes texture, how fast it dries, and how plastic it is. i form the same clay and: 80/10/10, with 8.2CEC, potassium body flux, with 30% plastic materials. You have much more fun than I do But TY.
  8. Lee: your option 2 will work. Powder down your reclaim: you only need 500 grams. Make 4-100 grams test samples. Bar 1 add 5% Nep Sy. Bar 2 Add 10% Bar 3 15% and Bar 4 20% all four are flat tiles. Fire them flat on a kiln washed shelf to avoid plucking. Then run absorption test on each one- be sure to note on each bar the Nep Sy addition. Whatever level produces 2% or under absorption level-use that to fix the rest. You only need to do this test once: assuming all your reclaim has had the same prior results. From this point, weigh out dry reclaim in bulk: do not need to powde
  9. Mousey: search clay makers and find a porcelain body with pyrophyllte. Grog is a widely misunderstood additive.
  10. Mary: in my testing, I noticed Hudson clay is extremely sensitive to application thickness. Also noticed color shifts when I increased potash content. Soon as I get time, going to slurry down a sample and spray it on. Tom
  11. Marbled being the key word--- first run some blend tests. 3-5-7% of stain: find your color. Chris Campbell is a good resource as mentioned. step 2 (requires some estimating). Slurry the white clay into a paste ( slightly thicker than honey) with the color blend you decide upon. the fun part- slab roll your clay down to tile thickness 3/8". Use a 1 or 2 or 3" paint brush ( brush size = color vein size.) paint a strip of yellow down the length, leave a blank stripe, then your other color, blank space, then yellow, blank, then color, etc. etc. fold over evenly, repeat proc
  12. Kaolin can have up to 15% natural shrinkage! most of which comes from combined molecular moisture. Specifications for natural clay are not expressed by "shrinkage" as is the case with blended clay bodies.LOI (loss on ignition) is used to express the loss of weight in comparison to the total weight. EX: LOI is 13% so for ever 100 grams of material, 13 grams will be lost when heating up to bisq temperatures. Organic materials, lignite coal, and molecular moisture are examples of materials lost on ignition. The primary reason kaolin is calcined (EPK) is control excessive shrinking of materi
  13. Rod: from table 1 in your link: Finnish clay is 50% silica, 18% alumina, 9% iron. In addition, 9% LOI and 3% carbon (discussed later. i saw nothing about lead or cryolite content, so that answers those concerns. Those addressed, your molten pool would be caused by low alumina, further compounded by the early reduction of iron (1750F/ 1000C) in a wood firing atmosphere. The 9% LOI would indicate sulfide/ sulfate content, coupled with 3% carbon. Carbon would be a direct indication of lignite coal particles. Sulfur/sulfide/sulfate content which is high in Finnish clay is directly invo
  14. 1st pic is bloating. 2nd is pinholes.
  15. Liam: i agree, Mark has an inspiring success story in the pottery biz. After 45 years in carpentry, I am aware of the time, energy, and sacrifices he made to build it. Pottery is unique; full time, part time, weekenders, full time hobby, to monthly dabble. My only intention starting out was to "play" with crystalline glaze, until I accidentally fell down this very deep rabbit hole. Rabbit holes are also unique, but also common in pottery. To answer the QotW: I do not want to make any pottery plans: because it is the only area of my life that is not. I find the unplanned happy accidents of
  16. I spent the last 45 years telling myself that, not sure I agree these days. like most here, my life was the typical series of following schedules to earn a living. Planning, plotting, and projecting the path ahead. I find myself curious about not going to bed in order to get up at regulated time. I am curious to know what it is like not to meet deadlines, keep appointments, and plan for months ahead. Not sure I even know what "living for the day" means. I have held many titles over the last 45 years, most of which have little meaning: I find "couch tater" appealing lately. T
  17. After working on and building a 1000 plus houses the last 45 years: carpentry and mechanical skills. Most know I only make and sell custom tile designs. That starts on my AutoCad system as a drawing; which I can print up to 24 x 36". From there it goes to the scroll saw, and individual pieces are cut out of 1/2" plywood. Next I cut 1.5" strips of metal 16ga.) on my brake. I either bend the folds on my brake, or heat it and bend to form circles, arcs, concave,convex- whatever. The metal is then stapled 1/4" x 1" to the edge of the plywood: and now I have a die. The only thing I hand cut is a me
  18. If no one else will, then I will post a line from the Tina Turner classic "Proud Mary keep on Rollin". And you should be proud. Figuring out a recipe is not easy. T
  19. Effect of Temperature on the Charge on Kaolinite Particles in Water Systems by D.D. Button and W.G. Lawrence (Alfred U) Journal of American Ceramic Society. @ 60F the charge on particles held in suspension drops by one third resulting in warping or irregular particle stacking. @140F the maximum zeta potential (particle charge) is obtained. application: store it and pour it. Tom
  20. Your clay is fine; just need to wedge it throughly. T
  21. Min: sorry it happened to you, never fun.
  22. Had a long discussion with the math professor from SIU-E about writing math equations for crystalline glaze: she thought it was doable. Interesting!

    1. Benzine


      You do eat it, but only a little over three pieces...

    2. glazenerd


      Are these three pieces squared?

    3. Benzine
    4. Show next comments  15 more
  23. I will post pics, but it will be late summer probably. Mark called it a 50/50 shot, I am going to attempt crystalline glaze, so that is probably a fair estimate of success. T
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