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I've used this glaze at 1200-1205 C and got lovely crystalline effects inside bowls and plates. It's more crystalline where thicker. On the outside it tends to run so best to use thinner and with wax resist on foot or bottom 0.5 cm.
In my experience it's been a stronger blue than purple but I love the blue. I've found it tends to run at 1220 if thick. With wax resist and thinning towards edge problem was solved. Crystalline effect in bowls is lovely.