The dry chemicals all last ages. Ferric Oxalate does go off when it's in solution. The metal salts (Pt and Pd) last forever in solution (with some qualifiers about how they're stored). Personally I wouldn't trust anything other than the Pt/Pd solutions. Ferric Oxalate is much, much cheaper than Pt/Pd so it's not worth risking a single failed print because of stale Ferric Oxalate. And mix fresh EDTA because it can take several years to discover that your EDTA was exhausted – and by that time your print is ruined.
Originally Posted by aaronmichael
Last edited by Ian Leake; 04-09-2012 at 12:21 AM. Click to view previous post history.