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How To Tell Mid Range From Low Fire Bisque


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I recently was experimenting with different clay bodies and, ugh to my total dismay and idiocy i didnt write down for each piece what clay body i was using. I thought since the clays looked pretty different wet i would be able to tell them apart! what was i thinking. Never again, i will take very careful notes from now on...however is there any way i can quickly tell what is low fire, mid range white and porcelain? pretty sure ill be able to identify the porcelain but im really afraid now. I am tempted to just glaze them all with low fire glazes and learn from my mstakes. I would hate to lose these pieces because some have turned out amazing for me. argh any suggestions?

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Only thing I can think of is to take a piece of each claybody, scratch the type of clay into it and bisque fire the same way you bisqued your other pots. Maybe when you compare the known samples to the pots it might become clear? Even so I would be hesitant to fire above low fire temps. We all make mistakes, just gotta move on.

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once you have done what min suggested, scratch and tap both to see if there is a special sound to help with the identity.  

 

i did the same thing once with white stoneware and a cone 6 porcelain which would have been fine BUT i also tried some coleman cone 10 porcelain in the same bisque firing.

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Would the low fire be more vitrified than the porcelain at bisque temp?

Different sound?

Different porosity

 

I would gave thought there would be a different feel....

Notes and different firing at bisque and different shel ves for ware awaiting glazing

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