Leach Clear (Cone 10)
This is Leach clear (even though the photo says "Leach White"). The picture I have included is the original recipe from Bernard Leach that I was given when I was a student at KU.
Kona F-4 no longer exists and so the popular substitution for it is minspar. I use this recipe as a white liner for my cone 10 containers that are lidded.
For a white glaze you add 10% zircopax if you want the clear, you leave it out.
A green celadon variation of it is to add 1-2% RIO or 5-6% celadon mason stain.