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Showing results for tags 'contamination'.
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Greetings good people please help me. I am an apprentice potter who's master works almost exclusively in porcelain and I've stained her plaster wedging table with a completely different clay body. I don't know it's name but it's a red clay, much stiffer, which fires to cone 11 where her porcelain is fired to cone 6. Is there a way to clean the pigment out of the plaster, and if I can't is there a risk it will contaminate her white clay in the future, will the pigment dredge up out of the plaster as she wedges? Part if me thinks it's harmless but I'm afraid I've ruined her table. When I've made reclaim in the past white crystals have formed on the surface as the plaster dries, will the red remove itself that way if I add water to the affected area? I really don't know what to do.
Hello, This is my first post, so please be gentle I just finished making my first plaster wedging table, and I'm experiencing something odd. No matter how much I sand, scrape, and clean the surface, little specks of plaster are contaminating my clay as soon as it hits. I've attached a photo. As far as I can tell, I followed the instructions for mixing the #1 pottery plaster. I also vibrated the mold to remove bubbles, and I've waited several weeks for it to fully dry. Has anyone ever had this problem? I know I could switch to another surface material, but I've always preferred how the clay moves on plaster, and I cherish it's quick-drying qualities. Any help would be greatly appreciated! Thanks, Matt