I glaze my bowls with blue rutile, dipping glaze pc-20. One of the two bowls that I glazed the glaze, ran off part of the bowl on part of the outside. See photos. Does anyone have any ideas on what this issue could be?
Thank you in advance for your advice and suggestions.
Scott
@Christykaake said your glaze âspitâ off your bowl.
@cmcooper0 i bet knows what could cause the glaze to do this.
What type of clay?
Were there any oils on the surface?
Wax resist?
Three possibilies come to mind, if you sand outside (green ware or bisque) and donât wash off the piece after bisque the glaze can stick to the âdustâ and spit off or pull away. Another possibility is that somehow wax got on it, maybe a contaminated brush or rag. Lastly, the glaze wasnât mixed enough before application since it settles out over time.
May not be any of those though, I like the look of blue rutile but I have horrible luck with it so I donât use it much.
A few more just came out of the kiln. I hope you can save them.
They were either brown stoneware or white. On the bowls I dipped the bottoms in beeswax. On the mug I glazed the bottoms. There may have been a little oil from my hands on a couple of the pieces, but it would not be oil or all of the items. The only thing that I have changed up is moving to a dipping glaze.
I didnât do sanding to those pieces. I donât think that will be the issue. I think I have a bad batch of glaze.
I found this article on glaze crawling and a discussion board topic that might have some answers for you.
Crawling looks very similar to the issue you are having. It looks like a pay wall but you can click the second link to get access.
I also found this discussion board that says floating blue glazes are prone to crawling:
âSmall spots on the shelf are likely from spitting, and can be caused by the boron. Large spots on the shelf and bare spots on the pots are different. When the glaze pulls away leaving bare clay we call that âcrawlingâ. It can happen when glazes are overlapped if the second dip is applied when the first dip is still too wet, or too dry. It can also be caused by the surface tension of the glaze during the firing, glaze thickness, firing parameters, etc. Floating blue can be prone to lots of different problems, including crawling.â
Sorry about your pots hope this helps.
