Let's Get Started with Single Firing - Electric Mid&Hi Fired Ceramics2024-03-28T10:54:20Zhttps://cone6pots.ning.com/forum/topics/lets-get-started-with-single?groupUrl=fireitonce&commentId=2103784%3AComment%3A8127&x=1&feed=yes&xn_auth=noGeorge Lewter said:Now that I…tag:cone6pots.ning.com,2010-11-08:2103784:Comment:81272010-11-08T22:56:47.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
<cite>George Lewter said:</cite><blockquote cite="http://cone6pots.ning.com/forum/topics/lets-get-started-with-single?groupUrl=fireitonce&#2103784Comment2319"><div>Now that I've actually had a couple of successful single firings I have to say the assumptions I started with don't really hold up. On Bone dry clay pouring an interior is OK on Laguna #80 and B-Mix 5. Immediately dipping of the exterior on B-Mix has caused my pots to blister on 2 occasions. The…</div>
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<cite>George Lewter said:</cite><blockquote cite="http://cone6pots.ning.com/forum/topics/lets-get-started-with-single?groupUrl=fireitonce&#2103784Comment2319"><div>Now that I've actually had a couple of successful single firings I have to say the assumptions I started with don't really hold up. On Bone dry clay pouring an interior is OK on Laguna #80 and B-Mix 5. Immediately dipping of the exterior on B-Mix has caused my pots to blister on 2 occasions. The <a href="http://cone6pots.ning.com/photo/november-2010-2nd-firing-002?context=user">little rings on this test cup</a> formed around the blisters that were in a band all the way around the cup. <br/>Waiting a day and spraying the exterior totally eliminated that problem. The problem wasn't as obvious with the #80 brown stoneware, but I haven't tested many pieces that way. My first experiments with dipping leather hard ware were pretty dramatically unsuccessful, so I discontinued that line of experimentation, but it may have just been the glaze was inappropriate.</div>
</blockquote> Comparison Tests from My Last…tag:cone6pots.ning.com,2010-10-17:2103784:Comment:76862010-10-17T22:25:24.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
<b>Comparison Tests from My Last Kilnload</b> I wanted to try single firing some pieces using the same glazes and compare how they came out versus bisque glazed pots with the same glazes.<br></br>
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These tumblers were glazed the same with C. Harris Temoku (the recipe I have published on this network) with a splash of Light Stormy Blue from the Hesselberth and Roy book <i>Mastering Cone 6 Glazes</i>. Both are on Laguna #80 brown stoneware. One on the left…
<b>Comparison Tests from My Last Kilnload</b> I wanted to try single firing some pieces using the same glazes and compare how they came out versus bisque glazed pots with the same glazes.<br/>
<p style="text-align: left;"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/3100440772?profile=RESIZE_1024x1024" alt=""/></p>
These tumblers were glazed the same with C. Harris Temoku (the recipe I have published on this network) with a splash of Light Stormy Blue from the Hesselberth and Roy book <i>Mastering Cone 6 Glazes</i>. Both are on Laguna #80 brown stoneware. One on the left was glazed raw when it was bone dry, the right one had been bisqued to Cone 05.<br/>
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Two jugs were dipped from the bottom up the sides in C Harris temoku (left one about 2/3 of the way - right one 1/3 of the way. A grey green scrap glaze was sprayed above and lapping over the temoku a bit. On the right jug the scrap glaze was a band with Jens Juicy Fruit sprayed at the top and lapping down over the scrap glaze. THE RIGHT JUG WAS SINGLE FIRED.<br/>
The above pieces were all fired in the same load with slow heating up through 1400 degrees F, normal fast as possible rise to cone 5 1/2 tripping off the kiln sitter, half hour hold at 2102, 1 hr hold at 1706, natural cooling from there. I fired another load that con…tag:cone6pots.ning.com,2009-10-29:2103784:Comment:29062009-10-29T03:48:45.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
I fired another load that contained some raw glazed pots, and though the glaze effects were nice, I had some serious body issues. The pots were tumblers like the three shown above and mugs. All had the same Richard Bush Nutmeg glaze as above and an accent glaze of Varigated Slate Blue from Hesselberth. I poured the interiors and dipped the exteriors and poured the accent color around the outside of the rims. It didn't take long until I saw blisters appearing mainly where the pots had been…
I fired another load that contained some raw glazed pots, and though the glaze effects were nice, I had some serious body issues. The pots were tumblers like the three shown above and mugs. All had the same Richard Bush Nutmeg glaze as above and an accent glaze of Varigated Slate Blue from Hesselberth. I poured the interiors and dipped the exteriors and poured the accent color around the outside of the rims. It didn't take long until I saw blisters appearing mainly where the pots had been wetted three times. I was able to press the blisters flat but the clay was delaminated and it got worse again in the firing.<br />
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As you can see, the blistering was pretty severe, and was present in all the pieces with this glaze combination. There was one blister in one of the mugs where only the Nutmeg glaze was located. It's really puzzling because the three tumblers from the previous firing were fine. My results were not perfect,…tag:cone6pots.ning.com,2009-10-06:2103784:Comment:25442009-10-06T01:20:24.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
My results were not perfect, but they were very encouraging. The pots I glazed leather hard, developed shivering problems before the firing and the repairs I attempted did not resolve all the problems. The black glaze (GA25 Ron Roy Black) popped off in places and melted into the interiors and left a few bare spots on the exteriors. The one that I brushed on did not have enough coverage to cover the white clay body.…<p style="text-align: left;"><img alt="" src="http://storage.ning.com/topology/rest/1.0/file/get/3127162477?profile=original"></img></p>
My results were not perfect, but they were very encouraging. The pots I glazed leather hard, developed shivering problems before the firing and the repairs I attempted did not resolve all the problems. The black glaze (GA25 Ron Roy Black) popped off in places and melted into the interiors and left a few bare spots on the exteriors. The one that I brushed on did not have enough coverage to cover the white clay body.<p style="text-align: left;"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127162477?profile=original" alt=""/></p>
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I got much better results with the pots I glazed at the bone dry stage. One of the three base glazes Waxwing Brown tends to bloat if at all over fired, and this happened on two cups I used it on, in combination with the black. This was not a single firing issue.<p style="text-align: left;"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127162658?profile=original" alt=""/></p>
I did get very pleasing results with Richard Busch Nutmeg and black on three tall tumblers.<p style="text-align: left;"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127162211?profile=original" alt=""/></p>
I didn't note any defects in any of the three. 1 a.m. Kiln shut down. Will p…tag:cone6pots.ning.com,2009-10-05:2103784:Comment:25352009-10-05T05:26:18.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
1 a.m. Kiln shut down. Will post results and pix tomorrow evening.
1 a.m. Kiln shut down. Will post results and pix tomorrow evening. At 11:30 a.m. the kiln was up…tag:cone6pots.ning.com,2009-10-04:2103784:Comment:25162009-10-04T18:04:31.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
At 11:30 a.m. the kiln was up to about 300 degrees so I turned it up and began firing in earnest
At 11:30 a.m. the kiln was up to about 300 degrees so I turned it up and began firing in earnest The pots are all dry. I peele…tag:cone6pots.ning.com,2009-10-04:2103784:Comment:25132009-10-04T08:29:02.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
The pots are all dry. I peeled off the loose glaze and touched them up with a brush. I mixed up a batch of Richard Busch's nutmeg glaze and applied it to four tumblers accented with Ron Roy GA25 black. (Both glazes have high caly content so might work for single firing. There are other raw pots with black and waxwing brown also ready to go. I packed everything in along with some test tiles and started the kiln preheating as the freshly glazed stuff is pretty moist. Depending on the temperature…
The pots are all dry. I peeled off the loose glaze and touched them up with a brush. I mixed up a batch of Richard Busch's nutmeg glaze and applied it to four tumblers accented with Ron Roy GA25 black. (Both glazes have high caly content so might work for single firing. There are other raw pots with black and waxwing brown also ready to go. I packed everything in along with some test tiles and started the kiln preheating as the freshly glazed stuff is pretty moist. Depending on the temperature when I wake up, I may either mix up a few more test glazes to throw in or turn that baby up to burn. I really need a test kiln. It's 4:30 a.m. and I'm a little punchy. Goodnight all. First setback noticed 9/19/09…tag:cone6pots.ning.com,2009-09-21:2103784:Comment:23502009-09-21T02:12:28.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
First setback noticed 9/19/09 - Glaze flaking off unfired rims and exteriors of both the dipped and the brushed pots (if this happened in firing it would be called shivering). Interiors did not seem to be affected. Attributable to clay body continuing to shrink after the glaze has more or less stabilized.<br />
…<p style="text-align: left;"><img alt="" src="http://storage.ning.com/topology/rest/1.0/file/get/3127163877?profile=original"></img></p>
<p style="text-align: left;"><img alt="" src="http://storage.ning.com/topology/rest/1.0/file/get/3127164233?profile=original"></img></p>
First setback noticed 9/19/09 - Glaze flaking off unfired rims and exteriors of both the dipped and the brushed pots (if this happened in firing it would be called shivering). Interiors did not seem to be affected. Attributable to clay body continuing to shrink after the glaze has more or less stabilized.<br />
<p style="text-align: left;"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127163877?profile=original" alt=""/></p>
<p style="text-align: left;"><img src="http://storage.ning.com/topology/rest/1.0/file/get/3127164233?profile=original" alt=""/></p> Tonight I raw glazed 3 leathe…tag:cone6pots.ning.com,2009-09-18:2103784:Comment:23372009-09-18T03:45:30.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
Tonight I raw glazed 3 leather hard pots. I was testing with GA25 Black which I believe is a Ron Roy recipe from Mastering Cone 6 Glazes. I chose this glaze because it tends to shrink and crack on my bisque pots if even slightly thick. For raw glazing I wanted the glaze thicker than normal, so I poured off the water at the top of the glaze bucket before stirring the glaze. Otherwise it was just my regula glossy black glaze. The first bowl had a tear at the rim, and I thought it might be…
Tonight I raw glazed 3 leather hard pots. I was testing with GA25 Black which I believe is a Ron Roy recipe from Mastering Cone 6 Glazes. I chose this glaze because it tends to shrink and crack on my bisque pots if even slightly thick. For raw glazing I wanted the glaze thicker than normal, so I poured off the water at the top of the glaze bucket before stirring the glaze. Otherwise it was just my regula glossy black glaze. The first bowl had a tear at the rim, and I thought it might be interesting to finish. I poured the interior and turned it upside down and dipped the exterior. It wasn't long before I noticed a vertical crack forming at the bottom of the tear. The rim was very thin there, compared to the rest of the rim so the expansion caused by the pot absorbing glaze pullted it apart at this weak point. Otherwise the glaze application looked good.<br />
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The next bowl had a split rim. I filled the groove with a sky blue glaze, and then poured/dipped the bowl the same as the previous bowl. I didn't have any problem with this bowl.<br />
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The third bowl I glazed by brushing with the same black, horizontally around the interior then vertically, then the same two coats around the outside. I added a coat of Storer Semi matte green around the upper outside surface and allowed some drips to flow down the exterior.<br />
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The three pots are drying. I will inspect them before and after firing them in a week or so. I threw 4 small bowls this ev…tag:cone6pots.ning.com,2009-09-17:2103784:Comment:23212009-09-17T03:01:21.000ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
I threw 4 small bowls this evening for my first try at raw glazing and single firing. I'm hoping my feet are projecting enough that I can hang on to them when I do dipping. Anyone else got any pieces in process?
I threw 4 small bowls this evening for my first try at raw glazing and single firing. I'm hoping my feet are projecting enough that I can hang on to them when I do dipping. Anyone else got any pieces in process?