My third glaze firing has produced better, but slightly unexpected results...
Just opened my small electric kiln to find that the plain white glazes are speckled blue. The effect is not unpleasant, but it isn't what I planned for.
Question: I had some cobalt blue glazes in the kiln and I think their strong blue colouring must have spread around the kiln?
Blues mostly were on bottom shelf and the most affected whites were on that shelf and the one immediately above it. The top shelf showed least contamination.
Question: Some of the ware may have been damp from glazing when it went into the kiln – might this have exacerbated the spread of blue through excessive water vapour?
Question: Some pin holes have also appeared in glazes in some places – due to moisture again maybe?
Question: one of the pots, the glazes have clumped together and some have run off the bottom of the pot in places. The pot was thin walled and quite damp from glazing the inside when I glazed the outside, I don't think the glaze 'adhered' very well to the damp clay – would this have exacerbated the slumping? This pot is shown in the second photo below.
The attached photos, the left area on the first pot and the lower areas on the second and third pots is the 'white' glaze that shows the blue speckling/contamination.