Here is a document containing a summary of my accumulated knowledge about fume firing. Saggar firing, tin-foil saggars, pit firing, low-fire salt firing: these are all terms for fume firing. I have even done fume firing in an electric kiln.
To print this handout on paperclay for sculpture, click the full-screen icon: at the top right in the viewer above
Then in the full screen viewer, choose “file” on the top left and underneath that choose print (pdf).