Developing Glazes Through Testing

Developing Glazes Through Testing is designed for ceramicists who are ready to move beyond using studio glazes and begin exploring how glazes are made, modified, and refined. Through a hands-on, methodical approach, this course will introduce the key principles of glaze testing—including how to use line blends, triaxial blends, and substitution testing to evaluate and understand glaze ingredients.

Rather than focusing on glaze chemistry, this class emphasizes the process of experimentation. Students will work primarily on small test tiles and will complete dozens of tests throughout the course, documenting and analyzing results along the way. You’ll learn to mix small batches of glaze, calculate recipes using a simple formula, and systematically adjust variables like colorants and fluxes.

We’ll discuss both the chemistry and the aesthetics of glaze: how materials interact in the kiln, how firing atmosphere and temperature affect the outcome, and how to observe and troubleshoot unexpected results. You’ll also have the opportunity to begin refining your own glaze palette, whether you’re seeking to develop soft satin finishes, bright colors, earth tones, or subtle texture variations.

By the end of the course, you’ll leave with a working knowledge of basic glaze testing methodology, a growing library of your own test results, and a sense of direction in your glaze development practice. This is a great starting point for anyone looking to take creative control of their surfaces and understand how glaze can enhance and transform your work.

Level: Intermediate

Prerequisite: Some prior experience with ceramics; comfort with basic glaze concepts is helpful but not required.

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Tools & Materials: We provide all the clay, dry materials, and tools needed for this introductory course. A selection of our favorite tools are also available for purchase in our on-site shop.

Firing: Test tiles for this specialized course will be fired as a group. Any additional work made in the studio during the 6-week course, but outside of class assignments, can be fired at our standard rate of $3.00 per pound.

Studio Access: As a student, you’ll have access to the studio outside of class hours to practice and develop your skills further!

Student Practice Open Hours:

• Tuesdays: 6–9 PM
  
• Wednesdays: 10 AM–2 PM
• Fridays: 6–9 PM
• Sundays: 1–5 PM

*Please note: The studio is occasionally closed for events. Be sure to check our studio calendar online for any updates or closures affecting open hours.

We reserve the right to cancel the class due to low enrollment or for other necessary reasons.

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Cancellation Policy:

• Cancel more than 14 days in advance for a full refund.
• Cancel between 7–14 days in advance for a 50% refund.
• Cancellations within 7 days of the class start date are non-refundable.

Missed Classes:

We do not offer refunds or make-up classes. If you need to miss a class, our staff will do their best to help you catch up during the next session or open studio hours.

Questions? Email info@taoofclay.com.