I'm trying to achieve some very distressed/geological/raw textures in abstract sculptures. I received very little formal ceramic training, but have several years of self teaching and throwing and pottery making experience, and do that full time now. But now I'm trying to flex some sculpture muscles, but find myself facing something totally different, as well as a shortage of information through google.
For my pottery business I make a lot of marbled pottery/agateware/swirlware, as I love just setting the foundation for great surface, and letting it do its thing. That's kind of the basis I have in mind for sculpting. After discovering Rafa Perez's work in an old Ceramics Monthly, my mind went wild thinking about making sculptures that grow and change in the kiln, and I have some ideas of where to go, but I'd like to bounce them around and maybe be clued in if these are futile/bad ideas, or advice on better methods to test.
Rafa Perez: www.mansfieldceramics.com/projects/rafa-perez-spain I've seen written many times his sculptures use layers of porcelain and expanding black earthenware to create this growing bursting effect, is this done through natural overfiring of low fire clay? Or is this likely a specially made body? I tend to think of overfired earthenware as puddles of melt, yet I can see a resemblance to the bloating nature of a slightly overfired stoneware.
Looking for growing clay also led me to another Ceramics Monthly article (https://ceramicartsnetwork.org/wp-content/uploads/2009/02/cmfeb04floating.pdf) which details mixing a specialty clay body in Japan. I've never mixed my own clay body, and don't have access to the equipment to do it super effectively, nor the regional materials he used. What I also lack is in depth understanding of clay chemistry to change what is used here into something usable. All of this being said, here are some things I've thought of that I want to try, but am afraid will do nothing, or much worse, damage something or ruin my 1 year old 'new' L&L kiln.
Specific ideas and questions I can't solve:
What are the stages of overfiring earthenware?
Adding Silicon carbide to a lowfire body and firing to cone 6, will this grow or will this melt?
Wedging lowfire and stoneware together and firing to cone 6 to try to get the lowfire to lose structural integrity and see how stoneware looks at end
What is likely to be the effect of small balls of dried crater glaze being lightly wedged into the clay body? Anything vaguely Shigaraki-esque with eruptions through body?
What are the safest/cleanest body additions for organic burnout for texture? I have my kiln in my sister's basement and want to minimize risks/smells.
How would a Earthenware slip react to overfiring, would it create an effect or just crack underlying stoneware?
What exactly is perlite used for as a body addition?
There's probably more. Any resources for other learning are much appreciated.