When I am putting bone dry clay in water to get it to turn into slip or to reclaim it, it can make a fizzing sound.
I also hear this fizzing sound if there is a little bit of clay left on the middle of a bat that had been wired off and I put water on it.
I had a piece that I made that was kind of close to bone dry, but the rim warped a little due to what I left it to dry on. I decided to try to keep spraying it with water and see if I could get it workable again to round out the rim. I was able to do so after carefully spraying and coming back and spraying again. Near the end of this, around when I started to get plasticity in the rim, I was getting bubbles in that part of the clay. I'm assuming that this is the same as the fizzing that I hear when slaking down clay. What's going on?
I'm thinking about mixing my own clay from raw materials.
I'm wondering what percent of the weight of moist clay is water so I can calculate how much cheaper it may or may not be to mix my own and decide if it makes sense. I've searched the internet but can't find what I'm looking for.
Let's say I want to make something with high fire clay that needs to be fired to cone 10 for vitrification.
Let's say I also want to use some premixed low fire glazes such as are used in schools on cone 05-06 earthenware.
What would happen if I fire the piece to cone 10, then paint it with the low fire glazes, then fire to the low fire temperature.
Will this work out okay or will the clay and glaze be incompatible in some way? Does it matter that the clay body will not be as open and porous when painted as it would be if it were just bisqued normally?