The Van Dyke process, invented by F. R. Van Dyke in 1901, created an intermediary print—a white line on a dark brown ground—that could be used in any of several other processes, such as blueprinting, to create a positive print, i.e.
In 1901, F. R. Van Dyke created the Van Dyke process, which generated a white outline on a dark surface that could be employed in multiple procedures, including blueprinting, to produce a positive image, specifically.