What's the difference between intaglio and siderography?
Intaglio
Definition:
(n.) A cutting or engraving; a figure cut into something, as a gem, so as to make a design depressed below the surface of the material; hence, anything so carved or impressed, as a gem, matrix, etc.; -- opposed to cameo. Also used adjectively.
Example Sentences:
Siderography
Definition:
(n.) The art or practice of steel engraving; especially, the process, invented by Perkins, of multiplying facsimiles of an engraved steel plate by first rolling over it, when hardened, a soft steel cylinder, and then rolling the cylinder, when hardened, over a soft steel plate, which thus becomes a facsimile of the original. The process has been superseded by electrotypy.