I don't know if this is addressed to Martin or myself. I used an OC safelight when soaking the prints in the potassium nitrate, let them dry in total darkness, then used the safelight when I loaded the paper into the contact printing frame. Washed the exposed print in water and fixed with hypo under the same safelight, just as I would do with DOP paper. No problems with fogging.
Originally Posted by PVia
Rlibersky (please see post #34 in this thread) soaked his paper in potassium iodide and found that his paper was fogged by his safelight when drying because the iodide made the paper sensitive to red light.