jasonarp Posted May 2, 2012 Report Share Posted May 2, 2012 Hi all, I inherited a 25 pound bag of gray/silver clay from an event I volunteered at. We worked in a kids art tent at a festival. At the end of the day they had 20 or so bags of this clay left over so they asked all the volunteers to take a bag home (we were all college art students). I was told it "may be low fire clay". I did a little bit of research but I can't find any slivery low fire clay bodies. I asked my teacher if we could test it because he is usually all about testing out new ideas, but this time he was really not into the idea. Does anyone know how I could test the clay? I do not have a ton of my stoneware left, and I want to continue creating over the summer. Thanks everyone, Jason Link to comment Share on other sites More sharing options...
perkolator Posted May 2, 2012 Report Share Posted May 2, 2012 test it inside of a pre-fired catch/test tray or saggar if you're worried about it turning into a puddle. tray must be fired first and crack-free. greenware test tray is just a bad idea. you could also ask the kids art staff where they bought the clay - most likely it was bought locally, so you could also ask your local clay suppliers if it looks familiar. Link to comment Share on other sites More sharing options...
jasonarp Posted May 2, 2012 Author Report Share Posted May 2, 2012 Should any old stoneware bowl work? I believe the clay was donated to the tent. Link to comment Share on other sites More sharing options...
Mark C. Posted May 3, 2012 Report Share Posted May 3, 2012 Put a small amount of the test clay (a small chunk ) in any high fire bisqued piece-It can be a pinch pot to a cup or bowl or a spoonrest-just something to catch the liquid mass of the melted low fire clay piece so it does not spill onto kiln shelves. Fire to cone 6 or cone 10 whatever temp you are working at. If piece is still intact and not melted its high fire if a puddle its low fire. Test is easy and safe Mark Link to comment Share on other sites More sharing options...
Pres Posted May 6, 2012 Report Share Posted May 6, 2012 Put a small amount of the test clay (a small chunk ) in any high fire bisqued piece-It can be a pinch pot to a cup or bowl or a spoonrest-just something to catch the liquid mass of the melted low fire clay piece so it does not spill onto kiln shelves. Fire to cone 6 or cone 10 whatever temp you are working at. If piece is still intact and not melted its high fire if a puddle its low fire. Test is easy and safe Mark You could go a little further and put a measured line a clay slab, and lay it in a bowl where it is supported only on the ends. Three things it would tell you-if it slumps, it is probably a couple of cones off, if it puddles, way off, if it slumps or does not you can measure the line and find out the shrinkage. One final test would be to check for absorption. You may not identify the clay, but you could pretty well classify it. Link to comment Share on other sites More sharing options...
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