Pin holing -Revised Sapphire Blue Glaze - Electric Mid&Hi Fired Ceramics2024-03-29T14:43:17Zhttps://cone6pots.ning.com/forum/topics/pin-holing-revised-sapphire-blue-glaze?commentId=2103784%3AComment%3A150068&feed=yes&xn_auth=noThe glare from the glossy sur…tag:cone6pots.ning.com,2018-07-20:2103784:Comment:1502822018-07-20T16:57:00.346ZJuanita Shorthttps://cone6pots.ning.com/profile/JuanitaShort
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127177634?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/3127177634?profile=RESIZE_1024x1024" width="721" class="align-full"/></a>The glare from the glossy surface made it difficult to photograph the pinholes. They're tiny & all over</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127177634?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/3127177634?profile=RESIZE_1024x1024" width="721" class="align-full"/></a>The glare from the glossy surface made it difficult to photograph the pinholes. They're tiny & all over</p> tag:cone6pots.ning.com,2018-07-20:2103784:Comment:1502792018-07-20T16:55:12.318ZJuanita Shorthttps://cone6pots.ning.com/profile/JuanitaShort
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127176797?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/3127176797?profile=RESIZE_1024x1024" width="721" class="align-full"/></a></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/3127176797?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/3127176797?profile=RESIZE_1024x1024" width="721" class="align-full"/></a></p> Just had a quick look at the…tag:cone6pots.ning.com,2018-07-20:2103784:Comment:1500682018-07-20T16:52:30.092ZJuanita Shorthttps://cone6pots.ning.com/profile/JuanitaShort
<p>Just had a quick look at the blog. Looks very complex. I'll give it a thorough read when I can concentrate. Hot & muggy in my neck of the woods right now!!!!<br></br> <br></br> <cite>George Lewter said:…</cite></p>
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<p>Just had a quick look at the blog. Looks very complex. I'll give it a thorough read when I can concentrate. Hot & muggy in my neck of the woods right now!!!!<br/> <br/> <cite>George Lewter said:</cite></p>
<blockquote cite="http://cone6pots.ning.com/forum/topics/pin-holing-revised-sapphire-blue-glaze?xg_source=activity#2103784Comment150065"><div><div class="xg_user_generated"><p><a href="http://cone6pots.ning.com/profiles/blogs/clay-tips-for-studio-potters" target="_blank" rel="noopener">http://cone6pots.ning.com/profiles/blogs/clay-tips-for-studio-potters</a></p>
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</blockquote> http://cone6pots.ning.com/pro…tag:cone6pots.ning.com,2018-07-20:2103784:Comment:1500652018-07-20T14:00:07.987ZGeorge Lewterhttps://cone6pots.ning.com/profile/GeorgeLewter
<p><a href="http://cone6pots.ning.com/profiles/blogs/clay-tips-for-studio-potters" target="_blank" rel="noopener">http://cone6pots.ning.com/profiles/blogs/clay-tips-for-studio-potters</a></p>
<p><a href="http://cone6pots.ning.com/profiles/blogs/clay-tips-for-studio-potters" target="_blank" rel="noopener">http://cone6pots.ning.com/profiles/blogs/clay-tips-for-studio-potters</a></p> I was joking about Ron :)tag:cone6pots.ning.com,2018-07-19:2103784:Comment:1501682018-07-19T22:51:30.742ZTom Andersonhttps://cone6pots.ning.com/profile/TomAnderson
<p>I was joking about Ron :)</p>
<p>I was joking about Ron :)</p> I think the recipe is fine as…tag:cone6pots.ning.com,2018-07-19:2103784:Comment:1501672018-07-19T17:45:40.029ZJuanita Shorthttps://cone6pots.ning.com/profile/JuanitaShort
<p>I think the recipe is fine as it is</p>
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<p>I think the recipe is fine as it is</p>
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</blockquote> Numerous tiny pinholes!!!! I…tag:cone6pots.ning.com,2018-07-19:2103784:Comment:1503592018-07-19T17:45:11.831ZJuanita Shorthttps://cone6pots.ning.com/profile/JuanitaShort
<p>Numerous tiny pinholes!!!! I really think it is coming from too thick of an application cause there's little to none where it is thin. Unfortunately, it's not blue enough when applied thinly.</p>
<p>I don't think there's an issue with the glaze recipe itself.</p>
<p>I shall look at my firing schedule and maybe re program. I fire a lot of semi-matte & glossy glazes in the same load and don't want to mess with the results I've been getting so far. </p>
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<p>I'll take a few photos…</p>
<p>Numerous tiny pinholes!!!! I really think it is coming from too thick of an application cause there's little to none where it is thin. Unfortunately, it's not blue enough when applied thinly.</p>
<p>I don't think there's an issue with the glaze recipe itself.</p>
<p>I shall look at my firing schedule and maybe re program. I fire a lot of semi-matte & glossy glazes in the same load and don't want to mess with the results I've been getting so far. </p>
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<p>I'll take a few photos & post if I can focus in on the pinholes without glare from the glossy surface </p> By the way: next time I talk…tag:cone6pots.ning.com,2018-07-19:2103784:Comment:1502732018-07-19T01:11:39.250ZTom Andersonhttps://cone6pots.ning.com/profile/TomAnderson
<p>By the way: next time I talk to Ron I will tell him to fix his recipe. :)</p>
<p>By the way: next time I talk to Ron I will tell him to fix his recipe. :)</p> Juanita:
you said " major pin…tag:cone6pots.ning.com,2018-07-19:2103784:Comment:1501642018-07-19T01:07:59.879ZTom Andersonhttps://cone6pots.ning.com/profile/TomAnderson
<p>Juanita:</p>
<p>you said " major pinhole" problem. Does that means numerous pinholes or large pinholes= blisters? A picture would certainly be helpful. Pin holes are most commonly from off gassing spars: mostly Nep Sy in the clay. However, you are using a red clay body: which means it could be a sulfide problem. Red and dark body clays equal higher iron, which in turn means high sulfide content. The solution for off gassing pinholes and the solution for sulfide blistering is not the…</p>
<p>Juanita:</p>
<p>you said " major pinhole" problem. Does that means numerous pinholes or large pinholes= blisters? A picture would certainly be helpful. Pin holes are most commonly from off gassing spars: mostly Nep Sy in the clay. However, you are using a red clay body: which means it could be a sulfide problem. Red and dark body clays equal higher iron, which in turn means high sulfide content. The solution for off gassing pinholes and the solution for sulfide blistering is not the same.</p>
<p>you can start here and check results. Use your current slow firing schedule, but ramp at 125F an hour from 2050 to 2230F. At 2050F the clay body starts to vitrify, and the porosity begins to close as glass forms. At 2000-2050F is also when spars reach their most active state: which also means increased off gassing. So going slow from 2050F to peak allows the body to mature, as it also allows the time for spars to off gas.</p>
<p>Now once you fire this schedule and you still have noticeable pinholes: then sulfides become the prime suspect. Sulfides mimic off gassing spars: but require a different schedule to resolve. Red and dark bodied clays are the most likely suspects to have sulfide issues. </p>
<p>Tom</p>
<p>i have a blog floating around here someplace called " clay tips for potters." There is a lengthy post on firing red/ dark bodied stoneware. </p>