yan6

I didn't kiln wash the lid and it doesn't look as though it has been previously, should it be? To me I wouldn't make sense since it's soft fire brick. *edit: you must mean a topmost shelf that acts as a lid I'm short on shelves and don't really have one dedicated to this yet. Also all the shelves I inherited are half shelves The shelves had been fired previously to cone 6 a few times on my watch and presumably before I bought the kiln I scraped them off as much as I could by hand before applying my new wash. After the wash I only fired the shelves to 1100degrees Celsius

Min, thanks for that comment, it makes perfect sense and I'll scrape off the edges once it's cooled down Hi Mark, sorry about that I should have been more clear, it's hi-aluma kiln wash https://psh.ca/products/5kg-glass-kiln-wash?_pos=2&_psq=kiln wash&_ss=e&_v=1.0

Maybe I panicked too early, I just hit 1100degrees and they seem to have mostly disappeared ?

Hi there, I'm just new here and completely new to ceramics as well. I just got an old electric duncan kiln and have been running it as purchased for a few firings now. The kiln shelves were pretty beat up and the wash had been flaking. As I'm starting to approach making things worth keeping i just redid the kiln wash by scraping off the ild with a wire brush and used PSH kiln wash. I decided to run just the shelves in the kiln a few days after the re-wash and they have started to show some dark spots. Are these of concern, did I do something wrong and what causes this. They kind look like mold spots, a greenish black.