I have a lot of dry clay I have saved to reuse. Most of it is in smaller pieces, I’m working my way to making it into powder. I’m thinking of getting a rock tumbler to make small batches of powder since most of the pieces are pretty small anyway.
Currently, i put the powder and sometimes granules into a bucket and pour white vinegar and very hot water over it, sometimes mixing immediately sometimes waiting for it to cool. I always let it rehydrate for at least a few days before drying on a plaster board.
Currently I mix the clay by folding and flattening, as this is easier than wedging for me. I’ll wedge smaller pieces, but for these larger ones I’ll pop the air bubbles and smooth it out. So far it’s been ok but I’ll sometimes have a bubble I missed until I am nearly done shaping on the wheel.
Does anyone have suggestions for how to decrease the air bubbles trapped from rehydrating? Would a vibrating paint mixer work?
I’ve had larger pieces that just didn’t rehydrate while everything else is a wet mess. I’ll use very hot water (our water heater is set to 180f) and vinegar, giving it at least a few days to a week to rehydrate. That’s why I started trying to get everything into smaller pieces or even powder. I’ve had the fewest air bubbles with smaller pieces or powder. I think air is trapped in the clay that doesn’t come out when soaking.