Printing Frames for photo-engraving are the only safe ones on the market.
Photography is the basis of all the mechanical processes that come under the general head of photo-engraving.
Autogravure, aw-to-grav′ūr, n. a process of photo-engraving akin to autotype.
This, however, is not the etching itself; it is a photo-engraving from the unfinished etching.
Before the last edition ...