How does that differ from a lithograph?
Rockwell’s lithographs are photomechanically reproduced just as the collotypes are. The difference lies in the method by which the image is transferred to plates for printing. The collotype was considered a superior process, thus some of the better Rockwell prints were published in this way. As mentioned above, there is a difference in the paper used as well. Collotypes required a special coated paper and the lithographs were printed on more traditional Arches paper.
