A clay stumper question for you.
My brother works for a ceramic tile company, and recently called me with a clay question that has him (and now me) completely stumped.
They roll out slabs of commercial clay fresh from the bags to make their tiles. Fresh out of the bag, the clay is perfect. When they cut out the squares from the slab, the edge scraps (still soft and pliable) get pugged using a de-airing pug mill. The ONLY thing they add to the soft scraps is a bit of water.
The pugged clay is now always completely short and breaks apart when they try to run it throu