Hi. I was looking for a nice white liner glaze and I came upon Turners White in a CAD article. It said it was good with cone 6 and cone 10 and mixes well with Mason stains. Sounds perfect to me,
The glaze called for soda ash which I was out of. I called my local pottery shop and he had Minspar 200 which he said should work well as a sub.
So I tested it at Cone 6 and it came out very underfired looking. It was dry and cracked
This is the recipe I made
Minespar 200 25
Custer Felspar 20
Zircopax 8 (I used Zircopax plus)
Is Minspar 200 a good Soda Felspar?
Could it have been Zircopax Plus instead of just Zircopax?
What can I do to fix this glaze for cone 6 firing.