Further to yesterday: the only recipe for which I had flux available was one using alkaline frit. So I weighed and slopped and began to sieve and belatedly discovered that the lumps of frit were not dispersible conglomerations but solid as concrete. After bashing with half a brick they still looked like this:
A sealed pack of frit was also trying to turn itself into lumps, though not yet fully gone off. I have dolloped some of that into the mix (and it did more or less sieve through) but have no idea how much to add. The lumps I removed can’t be weighed accurately as they are now wet, and will also have bits of the other ingredients stuck to them.
Oh well – everything about the next batch of ware will be experimental, so what’s another experiment …?