Some users have reported persistent "pepper" fogging with this paper when
printing
continuous-tone prints using dilute Lith developer. This is especially a
problem using
Champion Novolith, although it can also occur with Kodak RT.
It is believed that "pepper" fogging arises because an oxidation product
of hydroquinone
(present in both developers) causes early fogging of some grains.
Infectious development
then commences, and the result is as if someone had shaken black pepper
across the print.
This appears to arise because the preservative (usually sodium sulphite)
and restrainer
(potassium bromide), present in the stock developer, are diluted down
beyond the maker's
intended concentration in order to get contones.
The cure is to add sodium sulphite to the working solution.