Quote Originally Posted by Davec101 View Post
Interesting post i have recently encountered this exact problem with Arches platine and can vary from print to print,

Dave (I suppose that"s your name),
my advice would be to use another paper. I have used Platine"s different batches over the years, and have seen quite a number of bad batches, and non-announced changes in quality. I have run into trouble several times, and the time and energy I spent every time made me to discard this paper. Perhaps Arches tinkers with it for inkjet purposes and the like, even though they market it for Platinum.
You may run into further problems should you use other iron-salt processes which are more paper-sensitive than platinum (kallitypes are rather easy to manage either, though they also have their issues, but Mike Ware's formulation of New Cyanotypes or New Chrysotypes are considerably more sensitive).