This is the back of a fun bead that is all shinny from a reduction flame. While in my class a couple of weeks ago another student brought some old glass to share so I was playing with a rod of it. There is no way to know what kind of glass it is so it must be used all by it's self. Hence the fun shape rather than other colors of glass. I don't know what made me decide to see if the glass would reduce but I like the effect.