Gerstley borate and substitute testing. (Video #38 in FREE ONLINE GLAZE COURSE)

This is a short video showing some preliminary results of my testing of gerstley borate and it's substitutes. Not definitive. You can always go to my website : johnbrittpottery.com For more information on hands-on or Zoom workshops,. I also have about 15 PDF's that you can purchase digitally on various glaze topics which I will list below, as well as links to my Etsy Shop where I have a selection of pots for sale. BOOKS I have two glaze books published by Lark Book/Sterling/Barnes and Noble/Hachette Books: • “The Complete Guide to High Fire Glazes : Glazing and Firing at Cone 10“ • “The Complete Guide to Mid-Range Glazes; Glazing and Firing at Cones 4-7” DVDs • Understanding Glazes • Fundamentals of Wheel Throwing • Beyond the Basics: Tumbles, Cups and Yunomis • Beyond the Basics 2: Kurinuki • Fundamentals of Glazing: The Basics E-BOOKS (Downloadable PDF’s on a variety of topics): • Experiments in Manganese Gold and Iridescent Glazes in Electric Oxidation cones Part 1 • Experiments in Manganese Gold and Iridescent Glazes in Electric Oxidation cones Part 2 • Experiments in Mid-range Crystalline Glazes • Quest for the Illusive Leaf Bowl and other Assorted Article • I Need a Cone 6 Glaze that Doesn’t Craze Is it Food Safe? • All that Glitters is not Goldstone • Should I Slip and Score? • Is it Food-Safe? • Over the Counter Glazes • Gold Shino : Iron Golds and Iridescent Glazes at cone 10-12 Reduction • Secrets of Oil Spots: 25 years of Personal Exploration • Rust: Explorations into Faux Ceramic Rust Surfaces • Blue Oribe • Experiments in Gohonde spotting • Sculptural Ceramic Surfaces 2026 And my pots are on my Etsy Shop: https://www.etsy.com/shop/johnbrittpo...