Kathy McIntosh wrote:

I passed a charity shop the other day that had a box of a dozen Kilner
jars for sale. They were of the older type, with metal screw sections.
They were extremely rusty, and I wouldn't have wanted to put anything
remotely edible in them.

The metal rings have no contact with the contents. I'd use them
perfectly happily.

They wanted £50 for them!

But not at that price...

--
Rusty