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winstonzeddmore

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  1. I know it can be a hassle to use witness cones with every firing, but when you're having a problem - or fire as infrequently as you do - the witness cones will tell you what did happen. Also I'm wondering why you fired bisque so high? It will leave the clay more tightly grained and can make glazing difficult...
  2. winstonzeddmore

    Clear Glaze Forms Bubbles At Edges & Rims

    Roberta - it's absolutely possible that I've used too much stain. But... that wouldn't explain why the same thing happens with commercial underglazes, would it? I'm wondering if holding the mug or platter upside down over the glaze bucket to drain might be collecting too much on the rim? Babs, I think it could be crawling, maybe... I've had areas where the glaze AND underglaze are not adhered at all. They just lift off... I think I've been fighting this for abt 4 years! I fired a blue vase, same slip as the platter, and it was great? There just doesn't seem to be one thing that explains it
  3. winstonzeddmore

    Clear Glaze Forms Bubbles At Edges & Rims

    Babs - actually the glaze is fine on colored areas, too. It's just along rims and edges...
  4. winstonzeddmore

    Clear Glaze Forms Bubbles At Edges & Rims

    Hey everyone - thanks for your suggestions! I can add some info which might help... 1. I did a test with this clay, slip and glaze - No problems. Actually, it was from the first time I made the platter and the rim cracked So I bisqued a 2" X 5" section, dipped it in glaze and fired. It was good, so I made the 2nd & current platter. 2. Someone suggested a hydrometer so I got one and have been testing the glaze every time I glaze for a month or so. It's been at 1400 every time. I know anything between 1400 and 1550 is good - ago does this indicates that it's possibly on the thin side - or thick side?? I was also cautioned not to use glaze that's too thin! My head is spinning! 3. This same problem occurred on a mug's rim that had a different color on it. rim was really rough - attaching photos. Does this info & these questions change anyone's suggestions? And please explain about the damned hydrometer that comes with no instructions! Thanks Tons!
  5. winstonzeddmore

    Clear Glaze Forms Bubbles At Edges & Rims

    LT - I'm not sure what you mean? "If the rim is white" - do you mean on this piece by grinding off the bubbly mess? Or on a new piece, by leaving the edge bare - or applying white underglaze? I have ground off the bubbles on other platters, down to bare clay. I've then reapplied underglaze, dabbed on glaze and re-fired. The result? Usually more bubbles...
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