I am in search of a translucent clay body. It is my understanding that porcelain is the best (only) clay to achieve this. I am making luminaries with hard slabs. I was considering using Grolleg Kaolin and am researching Frost as an alternative. My main concern is a clay that lends itself to hard slab techniques. I'm also interested in firing at cone 10 or lower, preferably cone 6. Would firing a high fire porcelain at cone 6 affect the translucency, make it less translucent if fired lower than cone 10?