Thanks for all the info and updates folks. So, looks like my 70s A49 contains HEAP as the developing agent and is the original formulation, and ther 80s stuff is the updated formulation. Andreas' point noted - will certainly test before use.
I suppose there is no point worrying which is better as I only have enough of the original for 12 films!
Does anyone have any experience of how long a stock solution of any of this stuff stays usable?
Last edited by James1; 02-17-2013 at 07:24 AM. Click to view previous post history.