Ooh, it's getting exciting ... :) Indeed. Breaking the seal is irreversible, and if I have leaks, I contamina= te my flasks. Like this one: https://www.ebay.com/i/332271376045?chn=3Dps&dispItem=3D1 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .