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All info on this page was current during course registration in Apr 2022. Subject to change.


Do You Want to Learn How Glazes Work?

Have you been wondering any of the following…?

What are glazes made of? What do all the glaze materials do?

How can I prevent my glaze from running onto my kiln shelves?

How can I adjust my glaze from high temperature to a lower temperature (and vice versa)?

What makes glazes durable and suitable for food surfaces?

How can I prevent my glaze from crazing?

How can I create my own unique glazes?

Which colourants should I use to achieve a certain colour?

If you answered yes, you need to learn the Art of Glaze Chemistry!

Learn How Glazes are Formulated

The Art of Glaze Chemistry will teach you about the chemistry of glazes, how and why they melt at different temperatures, what gives them different types of surfaces like matte/glossy, and how you can adjust your glazes to solve common issues like runny or underfired glazes and thermal expansion issues like crazing, shivering and dunting.

Understanding and using glaze chemistry to create and adjust glazes is definitely not an exact science. There are subtleties and nuances and various factors that affect how a glaze will turn out. This is why I called this class The Art of Glaze Chemistry. It’s as much art as it is science.

But don’t get me wrong. There’s plenty of science involved. The art is in how you use the science.

And I want to teach you all of it!

Course outline:

  • What are glazes made of?
  • How glass formers, stiffeners and fluxes work together
  • Glaze materials and their function in a glaze recipe
  • The difference between cone 10, cone 6 and cone 04 glazes
  • Chemistry – Atoms, molecules and moles
  • Unity Molecular Formula (UMF)
  • Flux ratios, boron and durability
  • Food safety vs durability
  • The Stull Chart
  • Matte/satin/glossy glazes
  • Temperature and underfired glazes
  • How to use glaze calculation software –, Insight Live etc.
  • Material substitutions
  • Thermal expansion – prevent crazing, dunting, shivering
  • How to raise or lower a glaze’s melting temperature
  • Deep dive into glaze colourants and all the possibilities with each one

You Can Have an Advanced Understanding of Glazes

Don’t be scared! The topics are more advanced, but I promise to take you from wherever you’re currently at, all the way to having an advanced understanding with easy to follow lessons and explanations.

This course comes with lifetime access to the class recordings, so you can learn at a pace that you’re comfortable with and review as much as you like.

I hope you’re excited to take control and fully understand your glazes.

Who This Class is For:

This class is designed for potters who already know how to mix glazes from scratch and want to start learning about glaze composition and chemistry. I won’t be teaching you how to mix your own glazes in this course, it’ll be assumed that you already know how to do that.

If you’ve never mixed a glaze from scratch before, I recommend taking my Glaze Mixing Essentials Program program first. You can get started right away. If you’re determined and have the time to devote to learning about glazes, you could sign up for both programs and complete Glaze Mixing Essentials before you jump into the Art of Glaze Chemistry, or do both programs at the same time.

“The Art of Glaze Chemistry is an excellent class for any potter that would like to mix their own glazes, learn about the chemistry behind the glazes, and how this chemistry affects glaze results. Sue is an amazing and patient teacher! She is thoroughly organized and explains everything and answers all questions until you understand it. I love how I am able to put questions in the Facebook group and examples of my results and she’s answered them within a day or two.”
Deb B.

Course Details, Schedule & Registration

Start Date:

The course starts on Mon, Apr 11, 2022 with the release of Module 1.

Module Release:

Every Monday you’ll get access to a new Module. There are 8 Modules in total and we’ll have an “Implementation week” halfway through so you can get caught up on the lessons and glaze testing assignments if needed. The last module will be released on Mon, Jun 6.

Lifetime Access:

Once modules are released, you have lifetime access so you can go back and review them as much as you like.

Weekly Zoom Q&A Sessions:

We’ll have a 2-hour, live Q&A session over Zoom every Thursday at 10am Pacific time / 1pm Eastern time / 6pm UK time. First Zoom session is Thurs, Apr 14 and the last Zoom is Thurs, Jun 9. The Zooms will be recorded and uploaded to your student dashboard.

Student Community:

There’s a private, student community on Facebook for discussions and sharing glaze results. (There’s a non-Facebook community option as well, but most students will be using the Facebook group.)

Glazy BONUS:

All students will be given 2 months of free “Patron status” on We’ll be using the glaze calculation software on throughout this course. Patron status unlocks special features on the site like Target & Solve, Blends, Dark Mode, Calculated Thermal Expansion, Decimal Places and Limits. After your 2 free months are up, you can continue your Patron status by donating $2/month to Glazy developer, Derek Au.

“Sue McLeod’s “The Art of Glaze Chemistry”, takes a complicated subject and breaks it down into simple steps. Having specific experiments for key ideas really gave me a visual understanding of how various components of a glaze work together. Make sure you have at lease 50 test tiles ready when the class starts, and 150 if your curiosity can get the better part of your glaze experiments!”

Barbara N.

Make Your Glaze Testing Efforts Count

Once you fully understand the concepts I teach you in this class, which will require some glaze testing homework, you’ll be able to create, change and manipulate glaze recipes to get them working the way you want them to.

But it’s not going to be one and done. You have to be willing to put in the work, test and fail and learn and test again. I can teach you hours and hours of glaze calculation theory, but the knowledge really comes when you make the tests and then open the kiln and see results for yourself.

It’s like reading a book on how to ride a bike, versus getting on an actual bike.

The reason I have such a strong understanding of glazes is because I took classes to learn glaze chemistry and then I tested all the theories that I was learning to prove them to myself. It wasn’t until I did extensive testing that I finally felt like I really understood enough to teach others.

You’ll get out what you put into this class, but you don’t have to rush. You can take your time and I’ll be here to support you along the way. This 8 week class will just be the beginning.

Turn Glaze Confusion into Clarity and Understanding

It’s really life changing when something that can cause so much grief and frustration like glazes finally becomes rewarding when you understand why they behave the way they do and have the knowledge to troubleshoot and solve problems as they arise.

And the best part is when you can develop your very own glaze recipes out of thin air. This is what’s possible when you embrace and learn the art of glaze chemistry.

Watch This Video for a Preview of What You’ll Learn

If you’d like a glimpse of what you’ll learn in this course, watch my NCECA 2018 presentation – Understanding Cone 6. It may seem like gibberish right now, but by the end of the course, it will all make perfect sense. And don’t worry, the course covers all temperatures, not just cone 6.

If you have any desire to understand glazes on this level, then The Art of Glaze Chemistry is the perfect class for you!


“This class is good for someone who is ready to learn the why’s of glaze instead of just copying recipes from the internet. You will learn how to analyze a glaze and change characteristics with Glazy. Not for the faint of heart, this is in-depth study of how a glaze is developed and altered.”
Kat R.

Resources Included With the Program

You’ll have access to an extensive Resource Vault full of supplementary info that I reference throughout the course, for further learning of many topics related to glazes.

Here’s a list of what’s included in the Resource Vault.

Frequently Asked Questions

How long will I have access to the course for?
You’ll have lifetime access to the program so you can come back and review the lessons as much as you like.
What if I can't attend the Zoom Q&A sessions?
All Zoom Q&A sessions will be recorded so you can watch them anytime later. There’s also an opportunity to pre-submit questions and I’ll answer them, even if you can’t attend the Zoom call live.


Why are the prices in US Dollars?
Since my students are international, USD is the most “universal” currency option.


Does this course focus on cone 6 glazes?
The concepts you’ll learn in this class will be applicable to all glaze temperatures and you’ll learn how to raise or decrease the melting temperature of a glaze.


What if I live in another country and use different materials?
I’ll be teaching you how to look at the underlying chemistry of glazes, which is applicable to all materials around the world. All you need is the chemical analyses of your materials, which should be available from your ceramic supplier.


Do you offer an Independent Study option like you do with Mastering Glaze Consistency?
There’s no Independent Study option for The Art of Glaze Chemistry. Since the concepts I teach in this class are much more complex, I want every student to have the ability to ask questions and get clarification before moving on to each new lesson. It’s important to me to be able to support you throughout this learning experience so you finish the course with confidence, and not confusion.
What's your refund policy?
I’m offering a 12-day money back guarantee so you can complete the first 2 Modules and attend the first 2 Zoom Q&A sessions before deciding if you want to continue with the course. Refund requests must be received by Sat, Apr 23, 2022.

Your Instructor – Sue McLeod

I’ve been mixing my own glazes from scratch since my 2nd year of art school in 2009. Learning to mix glazes solidified my love for ceramics. It added a whole other element to working with clay that I didn’t even know existed when I started.

Chemistry was my favourite subject back in high school and it was so fun to be reunited with this subject, both on an artistic level and in such a useful way.

For 6 years, I worked as a ceramics studio technician at a busy public studio in Victoria, BC, Canada, where it was my job to mix and maintain the glazes for the studio and fire the kilns. During my time in this position, I was able to really apply all the glaze chemistry I had learned in various courses in order to troubleshoot studio glaze issues, improve the chemistry of problematic glazes and study the thousands of fired pots coming out of the kilns over the years.

Learning about glaze chemistry is an endless, lifelong journey. There’s so much to explore and I would love to help you get started on your own glaze chemistry journey.

Not ready to dive into glaze chemistry yet? Check out my blog and articles published in Ceramics Monthly magazine for lots of free information, or you may be interested in some of the other classes and workshops I have available online.

“This course provides the insight and resources to better understand glaze chemistry. I am so much more prepared to review and test new glazes. The ability to participate remotely in this course has been simply priceless. Thank you Sue!”
Claire O.


All questions about the workshop can be sent through my website contact form. I’d love to hear from you!

Registration currently closed

All info on this page was current during course registration in Apr 2022. Subject to change.