|Monthly Tech-Tip |
These two cone 10 porcelains have the same recipe (50:25:25 Grolleg kaolin, feldspar, silica). But the one on the left is plasticized using 3.5% VeeGum T while the one on the right has 5% raw bentonite. The VeeGum delivers better plasticity and obviously whiter color, but it is also acting as a very strong flux and has transformed the body into an over mature mass of blisters. That means it should be possible to make this porcelain using a 50:20:30 mix.
These two cone 10 porcelains have the same recipe. 50% Grolleg Kaolin and 25% each of silica and feldspar. But the one on the left is plasticized using 3.5% VeeGum T and the one on the right uses 5% regular raw bentonite. The VeeGum is obviously doing more than making it more workable, it is fluxing the body to make it much more translucent. Although not clear from this picture, the entire mug on the left is covered with blisters, it has over vitrified (while the one on the right is stable).