Squiggly Bead meltdown

I used to do beadweaving, so have a huge stash of glass beads, which I've been tempted to melt down/fuse.  I started with this small squiggly millefiori bead, and got quite an interesting effect.  Unfortunately the irridescent glass I used underneath didn't make any difference, as I did overfire the piece.  Lesson:- for "try-outs" - dont use anything expensive!