Didn't you mean 'there is no reason to purify it so that it's not (IN)active.'
Sorry Kirk, i think i get it now, it getting late in the day for me.
Photograde gelatin doesn't work with cyanotype for me, don't know why, just don't look good like Knox.
A friend of mine lives much closer to Buffalo than Rochester. A few years ago they changed his area code to 585, now all the calls he makes are long distance. Way to go Ma Bell!