Since Richard brought up experimentation with metal clay, I’ll add
my 2 cents worth.
I took an experimental enameling workshop a few years ago and in a
demo the instructor brushed some PMC slip as a final layer on a
fired enamel piece, then fired in a kiln for a few minutes at a
normal enameling temp. I think it was in a dot or line pattern. It
was a very nice silvery surface effect.
I’ll have to dig out my ancient PMC and try to reconstitute into
slip. PMC technique wasn’t for me but I’m glad I kept all those
little cubes of it.