Understanding Pottery: Chapter 8 Glaze Chemistry Part 2

Welcome to Understanding Pottery, Chapter 8: Glaze Chemistry Part 2 of 2. In this video you will continue to learn about the different materials that are used in glazes and what the role is in the glaze. This is the second chapter in the section titled Use of Raw Materials.
The next topic in the series is Oxides, Washes, Underglazes and Stains.
Understanding Pottery is a series in production by Washington Street Studios. The video series is a digital textbook that will take you through the entire ceramic process from the raw material through the finished ceramic pieces. There are five sections and twenty-six chapters planned in the series and they are:
Section I: The Pottery Making Sequence
Chapter 1: What is Clay?
Chapter 2: Clay Properties and Drying
Chapter 3: Bisque Firing
Chapter 4: Tips for Successful Glazing
Chapter 5: Pyrometric Cones
Chapter 6: Glaze Firing
Section II: Use of Raw Materials
Chapter 7: Chemistry for Potters
Chapter 8: Glaze Chemistry
Chapter 9: Oxides, Washes, Underglazes and Stains
Chapter 10: Geology for Potters
Chapter 11: Use of Local Materials
Section III: Kilns and Firings
Chapter 12: Atmospheric Firings
Chapter 13: Wood-Fired Kilns
Chapter 14: Gas-Fired Kilns
Chapter 15: Electric Kilns
Chapter 16: Raku Kilns
Section IV: Solving Problems
Chapter 17: Kiln Performance Problems
Chapter 18: Clay Body Defects
Chapter 19: Glaze Defects
Section V: Practical Applications
Chapter 20: Pottery Myths, Errors and Misconceptions
Chapter 21: Thixotropy, Quartz Inversions and Other Pottery Mysteries
Chapter 22: Pottery and Physics
Chapter 23: Pottery Figurin’ (Math)
Chapter 24: Personal Safety with Pottery
Chapter 25: Critiquing Your Own Pottery: Design Principles You Can Use
Chapter 26: Tips for Buying Used Pottery Equipment

At Washington Street Studios, we believe the sharing of creative energy and knowledge will improve the quality of our art and increase the appreciation of art within our community. We are striving to create an environment where the arts are shared and appreciated. We want to grow as a family of artists and contribute to our community. This podcast is one of our steps to share our passion for the ceramic arts, creative energy and knowledge with other artists and art lovers.

We also created an audio version to expand our audience. If you are looking for the podcast of our show search for the ‘The Potters Round Table’ on your podcast platform of choice.

[sandracartica]

All of these videos have invaluable information! I am so grateful to have access to this college-level learning. Thank you so very much. I hope to visit the studio once I am settled into my new home in Greeneville, TN... it's only a 3 hour drive. 🤩

[dccreations]

Please never stop these videos, such great videos. So informative.

[matheusmachadoalfradique]

Wow! There are no words to describe how thankful I am to be able to get this level of knowledge for free. Thank you for sharing and please keep up with the good work! ^^

[swayzevsnorris]

Do you have any documentation \ pdfs of your course? This is great stuff. I’ll recommend these to all the potters I know in Washington

[kaziebent]

Thankyou so much for your extremely informative and thorough tutorials. I have learnt lots!

[Vsmithpots]

Thanks for these videos, I wish I were closer to visit in person.

[michellemooney]

Love love love this info! Pure gold for me!

[freddiemoretti]

Very helpful, even with understanding what may be happening with brush on commercial glazes such as Oatmeal which tends to be as thick as porridge. First change will be to mix it with the electric mixer instead of by stirring.
Cosmic Tea Dust gets a lot of attention from folk.
Thanks again, cheers and stay well...Freddie.

[larrylass]

I found recipes and notes after viewing video. It would have been wonderful to have a link reminder as to their location in the video. I use a Tenmoku as a base glaze on a porcelain clay and fired cone 10 in an electric kiln. Various colorants are added so I have a range in colors. The glaze has variability so pieces are not identical (a desired look) and provides quality results with few flaws. Thank you for the video. It showed me why and how the components of Tenmoku glaze work together and what can be substituted if necessary.

[VFXited]

The initial handout of common glaze ingredients is missing continuing from the last video. Then from 41:05 (so just after “Original Randis Red Base cone 6” in the handout) to 46:10 (just before the “basic cone 10 ash glaze” in the handout), the notes inbetween are missing from the downloadable version, making it hard to follow from this point onwards. Could the handout be updated if possible please. The teaching is first class, thanks for these fantastic videos!!! :-)

[Workuj]

Thank you a lot that was of great help to me🙏

[salvaterrapottery]

I have learned tons from you already! Thanks so much. Problem I am hoping you can help with. I have a glaze I’ve consistantly used for years with great results. It has 5 percent titanium which gives me a nice white. When I tried this glaze with a glaze fountain it is streaky and goes yellow. Why do you think this is the case? Settling of the titanium to the bottom? Need to flocculate? Thought you might have a better understanding of the qualities of titanium and application. Thanks, Sue

[catelesco]

Could you mention what LEAD did for glazes, some of my favorite glaze colors had lead what would I use to replace it.?

[glendaneaton]

Is there any way I can find out what additives make what colour when added to a base glaze recipe? Is it possible to do a chapter on this?

[Kornol]

Question: There is one thing in glaze chemistry that baffles me. It concerns calcium, CaO, that we often source from ingredients like whiting, dolomite or wollastonite. What we want is the CaO, so why do we not use it directly? Sourced fom calcined sea shells for instance, which is coincidentially sometimes used for wadding in wood firings - so there should be ample supply, at least to a substantial portion of the potters. I feel like there is some important information that I am not aware of, staring me in the eye.

[rickwise]

Question: if you have a glaze that settles out quickly, is it OK to add some bentonite, say 2%, even though it is not part of the recipe?

[glendaneaton]

Is it possible to post the handouts or copies of some of the things referred to?

[zahramahmoud]

الجليز انواع ومراحل وانواع الحريق ومراحله من اسرار خبير الفخار وعلمه