Potters & Sculptors - Making Rock from Mud
We all know what a joy it is to apply a smooth, well behaving glaze. What about those glazes that seem to crack and chip off? Is there a common ingredient in the recipe that causes that? Light Stormy Blue is a glaze that I have had trouble with cracking and falling off. Any insight?
Light Stormy Blue is one of the colorant variations of the Zinc Semi-matte from Mastering Cone 6 Glazes.
This glaze has only 10% Kaolin and no other clay ingredients which is really the minimum needed to suspend the ingredients and hold the glaze together when it's dry. Another glaze with this problem is Weathered Bronze Green.
A small amount of bentonite, such as 0.5% VeeGum or even less Bentone-EW, sold by Trinity Ceramics, should resolve this problem.
Thanks Norm. I will check my notes to see if I added bentonite to the glaze when I mixed it. I typically add that automatically. If my notes show I already added 2% bentonite, would it help to add the VeeGum to the already mixed glaze? If so, how much would you suggest? Thanks.