With the fatter papers you can generally etch out the little black
spots, if they are on the surface. To hide your efforts you might try
rewetting the print and letting it almost dry. Take the damp print and
put it into a hot dry mount press (one with a very clean platten). The
steam swells the paper and the platen smoothes it, sort of like you are
recalandering it.
Good luck.
John
-- Alchemy Printmaking & Photography PO Box 633 Ranchos de Taos, NM 87557 http://www.quetzl.com/Alchemy/html.index