Klaus - certainly this will be for the same process. You can do it with any
paper I have tried, though the ease and extent of gelatine loss differ - you
need to make denser images on some paper than others, rub harder etc.
Peter Marshall
On Fixing Shadows, Dragonfire and elsewhere:
http://faraday.clas.virginia.edu/~ds8s/
Family Pictures & Gay Pride: http://www.dragonfire.net/~gallery/