Learning from Scrap

Once again, I can learn a lot from a little left over scrap glass. 

Scrap pendant using French vanilla, amber streaky and transparent clear - pre-firing.

Notice the location of almost all of the bubbles after the firing process; each is in the border between the French Vanilla and the amber streaky glass.  Did these two glasses react, was there still moisture in the adhesive the was seeking an escape rout, or....???????????

Scrap pendant using French vanilla, amber streaky and transparent clear - post-firing.