The Glazy website was created by Derek Au. Glazy was built using the latest open source tools, including Laravel and Bootstrap.

The Glazy database of ceramic recipes was seeded with data from Linda Arbuckle's GlazeChem database, John Sankey's glaze database, and Louis Katz's Hyperglaze database. John Britt, Alisa Liskin Clausen, Terry Rorison and Tara Hagen have also included their glaze tests with images.

Glazy is in continuous development, guided by technical input from a number of potters around the world. In particular, Pieter Mostert and Matt Katz have provided invaluable insights and suggestions.

Glazy is a work in progress. If you notice a bug or have an idea to improve Glazy, please contact us here.

If you have a question about a specific recipe or material, the Ceramics Recipes Group on Facebook and the Ceramic Arts Daily Clay and Glazy Chemistry forum are great places to ask.

The best way to support Glazy is to use it! Uploading images of glazes, verifying existing recipes, and sharing your own recipes helps Glazy become a more trustworthy source of ceramics information.

Glazy will always remain open and free. But the servers that Glazy run on are not free. Currently, the Glazy servers cost $50 USD per month (including one VPS web server and one VPS Mysql server). If you would like to help offset the cost of these servers, just click the Paypal "Donate" button below.

From July 2015 to August 2016, Glazy servers cost $32 USD/month. During that time Glazy received 15 donations totalling $409 USD ($389.76 USD after PayPal fees), paying for 94% of server time.

For the twelve months from August 2016 until August 2017, Glazy's servers will cost $600USD. For this time period, Glazy has received $1270 USD in total donations ($1213.53 USD after PayPal fees), paying for 24.27 months (202%) of server time.

New Costs for 2017: The Ceramics Wiki is an experiment to see if we can collaboratively build a ceramics knowledge-base. The Wiki is built with Discourse and is hosted on a separate server from Glazy. The Wiki server costs $40USD a month, or $480USD per year. Any extra donations to Glazy will be applied to the cost of the Wiki server. For the combined Glazy and Wiki server costs, donations have paid for 112% of server time.

Updated: 27 November 2017

To support the continued development of Glazy, please consider becoming a patron:

To make a one-time donation to Glazy using Paypal:

Glazy does not sell any product or service or benefit financially from providing the information on this site.

Ceramic Materials Workshop

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 kitchen and gallery, it benefits us to learn about how to speak through our materials. Mastering the skills of clay and glaze performance helps every ceramicists, become their best self in the studio. Ceramicists at all levels can now learn how Clay and Glazes function, online.

John Britt

John Britt is the author of the “The Complete Guide to High-Fire Glaze; Glazing & Firing at Cone 10”, and his most recent book “The Complete Guide to Midrange Glazes: Glazing and Firing at Cone 6”. John has also released ebooks and video tutorials, all of which can be found on his website.


Many of the recipes in Glazy have been published in books. Please support the potters who originally researched and published these recipes by buying their books. Apart from John Britt's books (linked above), some of the books referenced on Glazy are:

Other Resources

Recommend a book or resource by contacting us.

Glazy takes no responsibility for the recipes in this database. You should be aware of the dangers of ceramics materials when mixing, applying, and firing glazes. Recipes in this database contain dangerous chemicals that can injure or even kill you through short-term and long-term exposure when ingested, inhaled, or absorbed through the skin. Even after firing, glazes can leach toxic chemicals into food and drink. Ceramicists making functional ware should be especially vigilant in ensuring their glazes are food-safe.

Ceramic recipes "do not travel well" and are very sensitive to differences in materials, preparation (seiving and ball milling), application, firing, and cooling. Even for well-known and well-tested glazes, your results may be significantly different from others. Therefore, knowledge of how to test and adjust glazes is extremely important.

For more information, please see the Hazards information in Recipe Information section

  • Re-structuring of materials, material collections. Addition of regional and supplier-specific materials.
  • Allow for both a descriptive name and a code name. Descriptive name example: "Butter Satin-gloss with Iron specs". Code is a shorthand notation for a glaze such as "WWW 237 M1"
  • Calculated Expansion. Needs research and consensus.
  • PDF download of recipe. Currently, the "Recipe Card" function only supports download of jpg images.
  • Drag & drop photo uploader.

This changelog is a log or record of all or all notable changes made to the Glazy website.

The changelog will be gradually completed as time permits.



Added ability to collect recipes from any search page.


Fixed bug on material page where recipes not containing that material were incorrectly displayed. Also added the recipe amount of the material for each recipe.


Added ID search. Each recipe in Glazy has an ID. For example, the ID for is "4571". Now, you can enter the recipe ID into the keyword search field. However, note that the keyword search field will search for recipes with the ID or with that number in the recipe namd or description. So if a recipe has a description like "this is from a database of 1000 recipes", then that recipe will show up in the search results for "1000".


Added GHS and HMIS hazard warnings for most materials. Hazard information now displayed on Recipe page.


On hiatus


Fix bug in Recipe images slider when number of images is greater than 10. Add "Total Base" row to recipe materials summary.


Add LOI to Percentage Analysis on Recipe page.


Import of 860 recipes from Louis Katz's Hyperglaze database available on his website: More information about Louis Katz can be found on his website,


Fixed photo upload for large image files. The file size limit is now 6MB. Also fixed photo orientation issue.


Add image thumbnails to recipe carousel.


Updated CSS (Cascading Style Sheets) styling to latest version of Bootstrap Material Design


New Help format. Separate sections split into multiple pages. Table of contents updated. Added recipe mixing and testing pages. Added Orton cone page.


Use material "short name" rather than "long name" in recipe view. For example, for EPK the short name is "EPK" while the long name is "EPK, EP Kaolin, Edgar Plastic". The long name is used in the recipe add material page for easier lookup.


Ordering of oxides in recipe view. Later this ordering will be unified across Glazy.


Use image carousel for easier viewing of images and better page layout. Later, thumbnails will be added back in.


Add all oxides into UMF view. Formerly, only oxides that fit within the RO/R2O, R2O3, and RO2 groupings were shown. Now, oxides that do not fit within these three groupings are listed in an "Other" category.


Adjusted calculation of percentage analysis in Recipe view. Now, two rows of percentage totals are shown. The first row is unadjusted percentages, adding up each oxide amount actually contributed by each material. The second total row adjusts all these percentages to total 100%.


Keyword search greatly improved. Indexes of keyword search terms now include numbers (helpful for recipes that have numbers as names). Search uses MySQL natural language text search which ranks results by relevance.


To be added.


Glazy registration enabled.


Initial commit of Glazy code.