When something seems daunting, it's often best to try the easiest thing first. In this case the easiest thing is a one-for-one substitution, Nepheline Syenite for Custer Feldspar. A higher temp feldspar exchanged for a lower. This will work better for some glazes than others - I have one glaze that's already 71% Neph Sy, so I'll have to try a different approach with that one - but what better place to start than with my current darling, Jim Brown's Blue, which goes like this:
At ^6, it might look like this:Whiting 2800
Custer Spar 6000
Will it work? Well, I don't know! But it's starting point so my plan today is to mix up versions of many of my glazes with that simple switch.Whiting 2800
Neph Sy 6000
First test firing is April 24th.