Hi Evelyn, you might also be interested in the lithium borate flux used by Farley et al. to improve degassing of planetary samples for noble-gas dating: http://www.sciencedirect.com/science/article/pii/S0016703713000951 Cheers, Barbara Dr. Barbara Cohen, lunatic NASA Marshall Space Flight Center 320 Sparkman Dr., Huntsville AL 35805 o (256) 961-7566 | m (256) 975-1274 [log in to unmask] *********************************** The best way to predict the future is to help create it.