Terracolor 658 Symphony Blue From  £11.19

I've only used this glaze twice but each time have had beautiful blue results complete with the almost crystalline patterning, I can't see how to add photos but hope my firing method will help people who haven't found these results.
I fire to 1223°c, in an electric kiln, I ramp up at 60 degrees an hour to 600° and then 100° an hour to the full temperature and then soak for 15 minutes.

I've used this twice now and got the most beautiful effects, floating blue crystals and markings. Altogether wonderful.
I see others haven't been so lucky so this is how I used it. Poured on quite thickly, electric fired with a 60°ramp to 600° then on full to 1223° followed by a 15 min soak. Hope that helps👍
( All temps are centigrade)