This is a zinc-plate etching of a platypus fossil. It was done using the intaglio method (various grounds and resists) and a nitric acid bath. The fossil itself and the patterning to the right were hand-drawn using a hardground resist and stylus. The background texture is softground resist.
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sprackraptor reblogged this from scientificillustration and added:
(although I’m pretty sure it’s a plesiosaur rather than a platypus)
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