I have been experimenting for a while now with a ^10 glaze that uses both
rutile and gerstly Borate. I might add that while reading about piholing I
came across a suggestion that was also mentioned on the list. Try screening
the GB and the Rutlie through progressively finer screens to try and get
out any possible large particles of contaminants.
Also try to bisque to a solid ^04 and maybe even soak at that temp. Good
luck
