What’s up with all those pinholes? | For Flux Sake Episode 89

Pin holes are a pesky issue in ceramics, largely because multiple glaze defects are often called pinholes. The gang talk about the myriad issues with pinholes, and if you can fix them on an already fired pot. They also discuss why commercial glazes have wide firing ranges. They start the show laughing and questioning the existence of removable ceramic stickers. Do you have questions or need advice on glazes? Drop us a line at [e-mail] and you could be featured on an upcoming show.
For Flux Sake is hosted by Matt and Rose Katz of the Ceramics Materials Workshop along with Kathy King of the Harvard Ceramics Program. Together they answer your burning questions about clay and glaze. In each episode they answer listener submitted questions in a comical, but also insightful way. This show will have you laughing and learning about glaze chemistry the chemistry behind ceramics in no time. New episodes typically drop every week.
More information on Rose & Matt's ceramic glaze and clay courses can be found at www.ceramicmaterialsworkshop.com
For Flux Sake is produced by The Brickyard Network. More information can be found at www.thebrickyardnetwork.org
Today's episode is brought to you by Bailey Pottery Equipment (www.baileypott...) and (archiebray.org...) Cornell Studio Supply (cornellstudios...) .
This week’s episode features the following topics: pin holes, glaze void, refiring, reglazing, glaze temperature range, commercial glaze

[@jessicawright3290]

I learned (hopefully correctly) that pinholes come from off-gasing during the firing, the bubbles come through the glaze and the glaze doesn't have time/heat to heal over.
A glaze that occasionally has pinholes could just be from a bad glaze application. I will say that I don't typically have that issue with my mixed glazes, usually from commercial glazes.