Hopfer was one of the first German artists to practice etching as a print technique, which derived from the fifteenth-century practive of etching a surface decoration into iron armor with acid.

We have 3 objects that Daniel Hopfer has been involved with.

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<ref name=CH>{{cite web |url=https://collection.cooperhewitt.org/people/18042373/ |title=Daniel Hopfer |author=Cooper Hewitt, Smithsonian Design Museum |accessdate=9 December 2022 |publisher=Smithsonian Institution}}</ref>