I bought some stoneware spectrum glazes last week and whilst they've fired lovely, they're not the colours expected at all.
For example, I bought the Lagoon glaze, which is blue and lime green speckled on their example. I fired according to their instructions and mine has come out as a medium brown with very pale blue highlights. Not a trace of lime green to be found, certainly didn't expect any brown.
Another one was the "Textured Cobalt"...not a trace of cobalt or the mustard yellow to be found...instead I got a buff colour with seafoam (very pale green/blue). And another...the Cinnamon Ripple...no trace of white or the cinnamon/wheat colour...instead I have a yellow/orange straw colour base with bits of pink on it.
I fired to cone 5 with a 30 minute hold, medium speed, with kiln lid open a half inch for the first two hours of firing. 11 hours total firing. I have a Paragon Caldera with Sentry Xpress 4 controller.
Any idea where I've gone wrong?