Vaughn, how one double coats with salt print?
a. 1 + 1 salting and then 1 + 1 silver nitrate, or,
b. 1 salt + 1 silver nitrate and repeat?
(It's -a- I guess...)
P.S. I don't have experience w/ salt prints but w/ all other iron and iron-silver processes double coating significantly increases sensitizer contrast... Maybe that's how you've made it work???