As always, it seems that there is an appropriate thread for any pondering I may have going on. I measured out 4 glazes yesterday. A 5000g batch of clear, and 3 1000g batches of tinted clear. About 4:00 I am starting to sieve said glazes and I am having a heck of a time getting them through the sieve. And by the time I had it pushed through the sieve, there was almost a cottage cheesy consistency to what didn't go through. I running all the scenarios through my head while I am pushing this stuff through, messed up the recipe, mixed up the tubs o chemicals, held my mouth wrong......double checked, triple checked. Finally on the 5000g batch I gave up at 8:00. I just mixed it all together, cleaned up and came back into the house.
I woke up at 4 thinking about all this, and ah ha! The last two chemicals I purchased were Wollastonite and ff3134. The Wollastonite was a partial bag but it looks like Wollastonite....... but what if the 3134 was mislabeled? And because all the frits look the same, how would I know? And.....as much as I love my clay guy, there had been a mistake with frits in the past (sold me a bag of something labeled 3182, when I asked for 3124) sooooo how do I check for this?? Would having a different frit make that much difference in the consistency of the glaze?? After reading this, yes, it probably would.
I think it is likely to be the wollastonite causing the problem in the sieve. Wollastonite can be gritty and lumpy. If you have an old blender I would take what is left in the sieve plus some of the glaze and whizz it for a few minutes and see if that helps. If not I would add an equal amount more of wollastonite to what isn't going through the sieve and sieve that.
Since frits are ground I don't think it would be from that. I've never heard of 3182?
Yes, it apparently is the Wollastonite. I looked at the tub o wollastonite and you can see an obvious line between old and new. When you dig down to the old stuff, it is more fine and powdery than the new. Thanks for your help. I was ready to pitch all of it and start over!
Min and Old Lady! Thank you. Yes, it is VERY Gritty!! I thought that was odd also. After I posted I went back out to the shop and tried to resieve again. It was somewhat easier than last night, but still much more of a chore than normal. I will try the blender. No, Old Lady, no zinc. Here's the recipe.....I have used it for years. I think it is out of Mastering Cone 6.