Thanks, SD, I'll check into the Riverside Grit from Highwater. And John, since you say it's fun to wedge grit into clay with one's feet, I may try teaching these old dogs a new trick. And Shirley, you reminded me that there is a stoneware clay that when underfired produces a beautiful Caucasian skin color. Maybe I'll try wedging some grit into that clay -- using my feet, of course!
Thanks, all !
I just remembered that I have a bag of volcanic ash on hand. How does that compare to grog as an additive to clay to enable it to withstand thermal shock?