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Ever seen strange marks on your dried clay? It might be sodium deposits! In this video, Matt explores this phenomenon we encountered while developing a new casting slip for Kurt Hammerly Ceramics (@hammerlyceramics).

Inspired by a post on Instagram from Myra Rumsey (@mayamelissapottery), we dive into the science behind sodium deposits in clay and how different kaolins behave.

If you’re feeling inspired to learn more, deepen your knowledge with our online “Introduction to Clay Bodies” course → https://ceramicmaterialsworkshop.com/courses/introduction-to-clay-bodies.html

Heard enough about sodium flashing? Catch our podcast “For Flux Sake” (Season 2, Episode 4) for the full breakdown! →
https://ceramicmaterialsworkshop.com/podcastepisode/episode-40-why-does-my-glaze-leave-flash-marks-on-the-clay/

0:19 What do sodium deposits look like
0:51 Why does it look like that
1:07 Comparing EPK to Kingsley Kaolin
1:20 Comparing to Opticast
1:28 Why does it happen
1:50 How it affects firing results
2:25 Green vs. fired results
2:46 What to look out for
2:59 Learn more

If YOU’RE feeling inspired to learn more, deepen your knowledge with our online “Introduction to Clay Bodies” course

Ceramic Materials ​Workshop is a place online to understand and explore how and why our Clay and Glazes work (and don’t work). Our materials speak for us in the home and gallery. It benefits us to learn about how to speak through our materials. Mastering the skills of clay and glaze performance helps every ceramicist, become their best self in the studio.

Ceramicists at all levels can now learn how Clay and Glazes function with us online. Check out all of our resources on our website at www.ceramicmaterialsworkshop.com

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