Copper Sulphate - what' it good for? - Electric Mid&Hi Fired Ceramics2024-03-28T17:00:04Zhttps://cone6pots.ning.com/forum/topics/copper-sulphate-what-it-good-for?commentId=2103784%3AComment%3A121873&feed=yes&xn_auth=noI used copper sulfate in pit…tag:cone6pots.ning.com,2015-05-15:2103784:Comment:1217952015-05-15T11:56:38.835ZMarina Reijsmeijer (Kleierij)https://cone6pots.ning.com/profile/MarinaReijsmeijerKleierij
<p>I used copper sulfate in pit fires. Pour a solution of copper sulfate in water (1tbsp/2 cups) over your bisque ware before putting it in the pit and/or sprinkle copper sulfate powder over the wood in the pit. Results: reddish spots.</p>
<p>Spraying copper sulfate solution on bisque under a clear glaze and fire cone 6ox gives a watery blue effect.</p>
<p>I used copper sulfate in pit fires. Pour a solution of copper sulfate in water (1tbsp/2 cups) over your bisque ware before putting it in the pit and/or sprinkle copper sulfate powder over the wood in the pit. Results: reddish spots.</p>
<p>Spraying copper sulfate solution on bisque under a clear glaze and fire cone 6ox gives a watery blue effect.</p> Thanks for the info guys.tag:cone6pots.ning.com,2015-05-12:2103784:Comment:1218732015-05-12T00:20:08.235ZChantay Poulsenhttps://cone6pots.ning.com/profile/ChantayPoulsen
<p>Thanks for the info guys.</p>
<p>Thanks for the info guys.</p> I have used Copper Sulphate i…tag:cone6pots.ning.com,2015-05-11:2103784:Comment:1218682015-05-11T19:58:41.545ZJeff Poulterhttps://cone6pots.ning.com/profile/JeffPoulter
<p>I have used Copper Sulphate in recipes for electric fired self-reduced reds. The sulphate dissolves better in water and gives you a better looking red when using a really fine mesh of Silicon carbide. Like Norm's numbers indicate, it is not even as strong as the carbonate, but you don't need a whole lot when working with self-reducing copper reds. jhp</p>
<p>I have used Copper Sulphate in recipes for electric fired self-reduced reds. The sulphate dissolves better in water and gives you a better looking red when using a really fine mesh of Silicon carbide. Like Norm's numbers indicate, it is not even as strong as the carbonate, but you don't need a whole lot when working with self-reducing copper reds. jhp</p> If you are looking at novel m…tag:cone6pots.ning.com,2015-05-09:2103784:Comment:1216922015-05-09T18:17:25.543ZNorm Stuarthttps://cone6pots.ning.com/profile/NormStuart
<p>If you are looking at novel materials, do this Google search for <strong>decomposition temperature</strong> or <strong>melting temperature</strong>.</p>
<p><a href="http://www.google.com/#q=Copper+Sulphate+decomposition+temperature" rel="nofollow" target="_blank">http://www.google.com/#q=Copper+Sulphate+decomposition+temperature</a></p>
<p>or</p>
<p><a href="http://www.google.com/#q=copper+sulfate+wiki" rel="nofollow" target="_blank">http://www.google.com/#q=copper+sulfate+wiki</a></p>
<p>to…</p>
<p>If you are looking at novel materials, do this Google search for <strong>decomposition temperature</strong> or <strong>melting temperature</strong>.</p>
<p><a rel="nofollow" href="http://www.google.com/#q=Copper+Sulphate+decomposition+temperature" target="_blank">http://www.google.com/#q=Copper+Sulphate+decomposition+temperature</a></p>
<p>or</p>
<p><a rel="nofollow" href="http://www.google.com/#q=copper+sulfate+wiki" target="_blank">http://www.google.com/#q=copper+sulfate+wiki</a></p>
<p>to get this page</p>
<p><a rel="nofollow" href="http://en.wikipedia.org/wiki/Copper%28II%29_sulfate" target="_blank">http://en.wikipedia.org/wiki/Copper%28II%29_sulfate</a></p>
<p></p>
<p>This Wikipedia page (below) shows the blue hydrated version loses its water at 230 F to become <strong>the teal Anhydrous Copper Sulphate which then decomposes into Black Copper Oxide and Sulphur Trioxide gas at only 752 F</strong> (560 C), or Sulphur Dioxide depending on the conditions.</p>
<p></p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127170248?profile=original"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127170248?profile=original" width="562"/></a></p>
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<p>So you can see, working in ceramics, you're not going to have Copper Sulphate, but only Black Copper Oxide CuO.</p>
<p></p>
<p>So you might get lucky with this Google search </p>
<p><a rel="nofollow" href="http://www.google.com/#q=Digitalfire+copper+sulphate" target="_blank">http://www.google.com/#q=Digitalfire+copper+sulphate</a></p>
<p><a rel="nofollow" href="http://www.google.com/#q=Digitalfire+black+copper+oxide" target="_blank">http://www.google.com/#q=Digitalfire+black+copper+oxide</a></p>
<p></p>
<p>Which takes you to these pages</p>
<p><a rel="nofollow" href="http://digitalfire.com/4sight/material/copper_sulfate_239.html" target="_blank">http://digitalfire.com/4sight/material/copper_sulfate_239.html</a></p>
<p><a rel="nofollow" href="http://digitalfire.com/4sight/material/copper_oxide_black_237.html" target="_blank">http://digitalfire.com/4sight/material/copper_oxide_black_237.html</a></p>
<p></p>
<p>Here's both pages side-by-side. (<em><strong>click on the photo to expand it to full size</strong></em>)</p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/3127172228?profile=original"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/3127172228?profile=RESIZE_1024x1024" width="721"/></a></p>
<p>Digitalfire quickly tells you Copper Sulphate has only 31.85% as much Copper Oxide as Black Copper Oxide. The balance of the Teal Blue material burns-off in the kiln as sulphur trioxide gas listed as <strong>LOI</strong> = Loss on Ignition.</p>
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<p>So the resulting glaze color will be exactly the same as if you had added 31.85% as much Black Copper Oxide — or 49.46% Copper Carbonate which comes from the Digitalfire page for Copper Carbonate.</p>
<p></p>
<p></p>
<p>You won't always find a decomposition temperature for every material, but instead will find the Melting Temperature and the Boiling temperature - and that's good news if the temperature listed is hotter than your kiln — it means it's a suitable glaze material.</p>
<p></p>
<p>Take the ceramic flux Lithium Fluoride as an example which melts at 1,553 F (about ^013) and boils at 3,049 F, well above Cone 11 which is only 2,294 F.</p>
<p>If you could get a kiln that hot, the Lithium Fluoride will quickly melt then boil — then condense back into liquid Lithium Fluoride as soon as it finds a place cooler than 3,049 F and crystallizes into a solid at 1,553 F.</p>
<p></p>
<p><a rel="nofollow" href="http://en.wikipedia.org/wiki/Lithium_fluoride" target="_blank">http://en.wikipedia.org/wiki/Lithium_fluoride</a></p>
<p></p>
<p>Some potters are convinced Lithium Fluoride breaks down into Lithium and dangerous Fluorine gas, but the heat required for that is phenomenal, far, far hotter than the 3,049 F which makes it boil. A temperature so hot the number isn't even listed — and no one has a kiln that hot unless you have a research lab.</p>
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