I haven't been bothered with the sudden death syndrome of ascorbic developers yet, but that may be because of good chemicals and a clean water supply. However it's time to experiment with chelating agents. Dequest 2010 has been recommended, and EDTA was not recommended. I can get EDTA, but i have no clue where I can get Dequest 2010 unless I buy a long tonne of it. So who sells it, and do they ship overseas?