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Midrange Firing First


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I'm working with B3Brown (Laguna) and I really like the color and surface texture when it is fired (C5).  BUT stoneware glazes I use are bubbly/pin holed and dull - not matte but dull in color and surface.  Lower fire glazes are fine if I refire at 05.  I'm planning to bisque, fire to maturity, and then glaze fire at lowfire range. 

 

My question is, can I skip the bisque firing and fire greenware to cone 5, glaze, and fire to cone 05?  Would that be too much shock for the greenware?  I will test as needed but thought someone might know.  Thanks! 

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Laguna B3 is a dark manganese clay body that fires to almost black at ^5. I can see why ^5 glazes aren't working well for you. Yes you could fire it to ^5 first without bisque if it completely dry and others work aren't in the kiln. You'll need to fire slower. Then you can go back and glaze fire at ^05. Use precautions with manganese clays. Manganese can penetrate skin on contact. Fumes during firing are hazardous.

 

 

Many mid-range glazes are enhanced if you soak them for 20 minutes to 2 hours or so at the high temperature. Then you can soak again around 05 on the way down as it is cooling and not fire them twice.This helps with iron red.

Your firing sounds underfed- dull, bubbly and pinholes. Fire your bisque slower to get rid of impurities causing pin holes. Some will disagree. Smooth out pinholes if you see them as you're glazing this can also be caused by the porosity of the bisque. dampen the bisque before glazing or ujst rub them when the glaze is dry using a dry finger.

 

Marcia

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