Bryan, what type of tumbler do you use? I wonder of yours do not suck in air as it tumbles.

I tumble all my bisque shards for various purposes and do not experience anything like you describe. 

Best wishes, 

Antoinette Badenhorst


PorcelainByAntoinette  

TeachinArt

International Academy of Ceramics

Mississippi Arts Commission





On Jan 29, 2022, at 5:59 AM, Bryan Johnson <bryj@cheqnet.net> wrote:

That was my first guess, but it is way more than the water displacing the
air in the pores.
Bryan Johnson

On Fri, Jan 28, 2022 at 7:31 PM Robert Harris <robertgharris@gmail.com>
wrote:

If it's bisque, then I assume it's just air from the pores. Even if you wet
it well first, some of the porosity will take a while to fill.
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