…And what to use if you don’t have one. I use a graduated cylinder for measuring specific gravity. A slender container is going to have smaller increments than a wide container, giving higher accuracy.
In this video I demonstrate how to measure the specific gravity of a glaze I just mixed using a graduated cylinder and a scale.
If you have too much clay in a glaze recipe, you might have issues with your glaze crawling during the firing. Crawling is where the glaze pulls away from the clay body due to a combination of shrinkage, poor adhesion and high surface tension.