What porcelain for Cone 4-6 firing in electric kilns do you prefer (brand, #)? Do you buy it locally or by mail? What does it cost to you in the end (and in what quantity)?
Did anybody try P-5 porcelain sold by Clay King?
What cone do you fire yours to for functional pottery? I mean if it's Cone 5-6, do you prefer to fire it to ^5 or to ^6?