Quote Originally Posted by nze View Post
...If you keep The RH @70% you wont need any developer but if you go under you'll need some for the Ware version. Sullivan method is less sensitive to humidity and you can go down to 50% as lithium palladium seems to absorb more humidity than ammonium salt....
In any case adding few drops of glycerin (2 is good to start with) per 1 ml of coating solution will help much in keeping moisure in paper - hence the print out ability of the sensitizer - even in the driest conditions. You can get interesting colors too... (This works for POP Pd and also for Argyrotypes.)

Regards,
Loris.