Digital BW, The Print

Hi,
I've just printed a couple of portraits with black backgrounds and there are roller marks present in the black areas.

Does anyone know how to fix this?

Many thanks,
Richard
--
http://smallfield.vze.com
http://photos.smallfield.vze.com (Photos web site)
http://warkworth.vze.com/ (Warkworth photo essay)
http://picasaweb.google.com/rsmallfield/ (Recent work) 

   "It is better to light a small candle than to curse the darkness."
   --Confucius