I had a bucket of totally dried out glaze. I slaked it down then ssieved it. I was left with slurry of stuff which would not pass through the sieve. I seived, watered down a number of times and still no go.
So I will test the glaze, minus the gritty stuff before use. the glaze recipe is below. Which component would give this problem.
The fact that I did not use this glaze for years does make it non precious to me but I am just interested as I now do work that I could use bits of glaze to layer onto pieces so saving throwing out these part buckets.
If there is an identifyable chemicla I'll just not waste time with them.
De Boos Mushroom.
Frit 3134 50
Potash Feldspar 20
Ball Clay C 20
Mg Carb light 10
Tin or Zirc 10