|Monthly Tech-Tip |
The drying shrinkage of the engobe (and stickiness that goes with that) are important for adherence during application at the leather hard stage. And also to shrinking with the body during the drying process. But not on bisque ware. If, however, the engobe is gummed it can often adhere to the bisque (but the fired bond with the body will not be as good as when applied at leather hard stage).
Engobes are high-clay slurries that are applied to leather hard or dry ceramics. They fire opaque and are used for functional or decorative purposes. They are formulated to match the firing shrinkage and thermal expansion of the body.