Potters & Sculptors - Making Rock from Mud
Here is a list of critical temperatures to consider when selecting a firing schedule. The same can be used to trouble shoot potential glaze and clay defects. They are given in C and F temperatures.
130-140F (55C) (Candling) used to rapid dry green ware to bone dry pieces. Most often used by production potters to meet deadlines. Can cause stress fissures on larger pieces or with certain types of clay.
200-392F (100-200C) atmospheric moisture is…Continue
Added by Tom Anderson on July 31, 2018 at 11:20pm — No Comments
Several recent posts inquired about pin holing in glazes: and asking if clay was involved. With that, I thought I would share some USB pics from a study I did a couple of years back.
Nep Sy is the flux of choice in most commercial bodies because of the price point; nearly a third less than the cost of potassium spars. However, Nep Sy.contains 14-20% soluble salts that migrate as the clay is drying to a bone dry state.…Continue
Added by Tom Anderson on July 19, 2018 at 6:49pm — No Comments
While researching material for the latest newsletter, I stumbled on this gem from StudioPotter.org. It's a well-written defense of digital printing and new technologies in the ceramic studio. If nothing else, this graphic included in the article is relatable to many of us on a number fronts, I'm…Continue
Added by Erik Evans on May 31, 2018 at 11:00am — No Comments
I had intended to post frequently during the retreat, but we stayed so busy with our activities that I kept putting it off. Then suddenly, it was over. The Gallery Lodge in Kasilof, Alaska was a magnificent location for our event, and the accommodations were first class.
Dot was in the…Continue
Arrived in Anchorage yesterday and the drive down to Kasilof was spectacular. Dot's Gallery Lodge is far better than I was expecting. We'll use the garage as our studio, but she has a new studio under construction that will be a strong community gathering point for many years. I'm so glad I met her in Fort Lauderdale two years ago. Watch this space for more as we have our Alaska clay experience. The retreat starts tomorrow.…Continue
Added by George Lewter on August 14, 2017 at 12:36pm — No Comments
I often decorate my pots with brushwork. Pursuing an ultra thin line, I've found my cat's whiskers work the best. They're not purrfect (that's right, I said it), but they produce some interesting results.
Taped individually to a stick, I dip the whisker into some fairly viscous underglaze, then…Continue
In February I heard about a major ceramic studio tour in Phoenix AZ, and decided to make an overnight trip to visit the studios and to take in the ASU Ceramic Research Center Museum, with what is widely recognized as the best collection of ceramic art, from the 1950s through the present, in the United States. I was amazed by the variety and quality…Continue
Been a while since I have posted here. You may find some of my recent posts of interest.
Added by E. Preston Rice on February 14, 2017 at 10:06am — No Comments
A journey of a thousand blogs..., uh..., begins with a blog, though I suppose this is really more of a test drive ;).
I'm finally getting around to experimenting with glazes a bit..., moving beyond the recipes provided by my instructor.
I've been looking forward to this a long time..., anticipating it. So naturally...
When came the time to combine the dry with the wet..., what do I do?
I invert the proportion of glaze materials to water..., so end up with 4 times…Continue
Why aged clay is smoother?
Stoneware in particular changes characteristics over time, but all clays do to some degree. The common thought is because of bacterial growth (fungus/mold, etc. Bacterial growth is a reflection of how much organics is in the clay itself (ball clay primarily). If you are getting a lot of bacterial growth on your clay: it indicates high levels of organics: which means you need to bisq slightly higher, or with a hold to burn them off…Continue
Flat fish, swimming free on a dinner table, their goggly eyes staring, their mouths half smiling, their tails flicking and their bodies tattooed became the obsession of the end of summer. Alongside a forest of unassuming tubular forms, each slightly beckoning or retreating, pensive or impatiently looking skywards. The colours of the sea and the sky. The porcelain shattered in inexplicable ways. The glazes blistered or ran or jumped over obstacles and bridged ravines at will. The winter…Continue
Added by Olinda Everett on November 9, 2016 at 5:29am — No Comments
After finishing my porcelain clay study, I have moved on to stoneware bodies. At this point, all I am doing is studying PSD (particle size distribution). Typically commercial stoneware bodies run between 10-20% large particle size ( mesh 30-70). I will not bore you with a photo gallery, but just the difference between 20% hawthorne 35m and 50% hawthorne bond 35m is very revealing. I have seen numerous clay recipes with 40-50% large clay particles in their recipe.…Continue
I have been testing porcelain bodies for nearly two years. Recently I purchased a 1600X lab scope to help me see what I had long suspected.Continue
I must admit, I've never been terribly disciplined about my test tiles through the years. I'm pretty good about taking careful notes; too many times I've been burned by shoddy notes. However, I do tend to slap those careful tests on whatever's laying around. The result is a box full of…Continue
I got a chance to try one last winter at MIY Ceramics and Glass in Hollywood, Florida, and knew I wanted one of my own.
This is set up to make a platter or shallow bowl with a mouth 12" long by 8" wide. The depth is 1 3/8". The mold sections slide in pairs allowing you to set any…Continue
If you ever used bentonite, you know it's a bear to mix into a glaze. It tends to clump together in solution. It doesn't want to play well with others. I've tried a number of things over the years to get around this. I thought I'd share this latest method that works for me:
I first look for the dry clay in my recipe, usually EPK. Even if it's a small percentage of my recipe, I measure this out first, and place it in a resealable plastic bucket (I bought mine in the paint…Continue
What I need now is a device which prevents studio members from dropping tools and valuable extruder parts in our washing tub which collects clay and heavy metals from glaze for disposal.
Going through the muck prior to disposal is always a treasure hunt.
Added by Erik Evans on April 14, 2016 at 1:19am — No Comments
Well this is pretty annoying... Just for laughs I compared a brand new K thermocouple with the one in my kiln. The one in the kiln still has lots of metal fused at the junction so i figured that they would be pretty much the same.
SURPRISE! one read 34.6 mv and the other 36.4mv. So I thought i would try a third as a tie breaker... 33.9 mv. The third one was just a wire probe rather than the beefy kiln probes. but it was a K. type
we're talking about a 300 deg F+ spread at…