Yeah, the muddy look you are getting is phase separation. The crystal growth happens fastest around 1200. If you leave it there too long, it's bad... very ugly dull muddy colors. You can work boro for a long time... just make sure it's way above 1200 or well below if it's to remain that temp for any length of time. This includes flame time and kiln time. It is tricky at first, but you'll get it. Putting those beads back in the kiln won't do squat. Sorry. Just start new and have fun! Turn your kiln down to 1050 if you're flame striking the beads. The colors may deepen, but shouldn't turn muddy.
