Alternate Names: Gilespie Borate Description: Gerstley Borate Substitute This substitute became available during the early 2000s and won the attention of many Gerstley Borate (GB) users (it is still available in 2023 and they state readiness to take the market from GB). With Gillespie Borate they claim to achieve chemistry, mineralogy and physical properties very similar to GB. They went well beyond what other companies did in explaining their research, development and testing (however their QuickFacts web page is now gone). Of course, it is assumed this material does not turn glaze slurries into a bucket of jelly the way GB did. "Gillespie Borate is a blended borate mineral for use in glaze formulas replacing Gerstley Borate on a pound-for-pound basis. It has better consistency, gives increased glaze surface smoothness, reduces crawling and pinholes and has fewer impurities so glazes and colors are brighter." More more information visit digital fire: here
